Your internet drops because something between your device and your ISP's equipment is breaking the connection
When your internet cuts out, the problem is almost always one of three things: your modem losing power or connection to your ISP, your router failing to send the signal to your devices, or something physically wrong with the cable or line coming into your house. The reason it feels mysterious is that you cannot see any of these parts working, so when they fail, you have no way to know which one broke without testing them one at a time.
Most people restart their router when the internet drops, and it works — but that fixes the problem only by accident if the router was the actual culprit. If your modem was the problem, restarting the router does nothing, and the outage will happen again in a few hours or days. Learning to identify which part is failing means you can fix it the right way instead of guessing.
Key Takeaways
- Internet outages usually come from your modem losing connection to your ISP, your router failing, or a physical problem with the cable entering your house.
- You can tell which part failed by checking whether your modem's lights stay on and connected during the outage — if they go out, the modem failed; if they stay on, the router failed.
- Restarting your modem (waiting 30 seconds before plugging it back in) fixes most outages caused by the modem overheating or getting stuck.
- If outages happen at the same time every day or during heavy rain, the problem is usually the cable or line outside your house, and you need to call your ISP.
- A modem that is more than five years old or a router that is more than seven years old is likely failing and should be replaced.
How to tell if your modem or router is the problem
When your internet drops, walk to your modem and router right away and look at the lights. The modem is the box that connects directly to the cable or phone line coming into your house — it is usually smaller and sits near where that cable enters. The router is the separate box (or sometimes built into the modem) with antennas or a flat design that broadcasts the wireless signal to your devices.
On your modem, look for lights labeled "Internet," "Online," "Link," or sometimes just a globe icon. If that light is off or red during the outage, your modem lost connection to your ISP — that is the modem's problem. If that light stays green or blue and solid, your modem is still connected to the ISP, which means your router failed to pass the signal to your devices.
Write down what you see the next time it happens. If the modem light goes out every time, you know to restart the modem. If the modem light stays on but your devices cannot reach the internet, you know to restart the router instead. This one observation saves you from weeks of guessing.
Restarting your modem the way that actually works
Most people unplug the modem, count to three, and plug it back in. That does not work because the modem still has power stored in its capacitors — the internal parts that hold an electrical charge. You have to wait long enough for that charge to drain completely, which takes about 30 seconds.
Unplug the modem from the power outlet. Wait 30 seconds — actually count it or set a timer, because 10 seconds feels like 30. While you wait, do not touch the modem or press any buttons. Plug it back in and wait for all the lights to come back on and stop blinking, which usually takes two to three minutes. During this time, the modem is reconnecting to your ISP.
If the outage was caused by the modem overheating or getting stuck in a bad state, this restart will fix it. If the outage happens again within a few hours, the modem has a deeper problem and needs to be replaced, or the problem is actually the cable coming into your house.
When the problem is the cable or line outside your house
If your modem light stays green during outages, or if outages happen at the exact same time every day, or if they get worse during rain or wind, the problem is not your equipment — it is the physical cable or line between your house and your ISP's equipment down the street.
Cable can fail because it is old, damaged by weather, pinched by a tree branch, or cut during construction. Phone lines can fail for the same reasons. Your ISP has to send a technician to your house to find and fix the break, and you cannot fix this yourself. Call your ISP and tell them your modem stays connected but your internet drops, and describe when it happens — "every morning at 8 a.m." or "whenever it rains" tells them a lot.
Before you call, write down the dates and times of the last three outages. ISPs track outages in your area, and if multiple customers report the same pattern, they can pinpoint the problem faster. If you live in an apartment or condo, the problem might be in the building's wiring instead of the line outside, and your building manager may need to contact the ISP.
Why your modem or router overheats and what to do about it
Modems and routers generate heat while they run, and they have small fans or vents to cool themselves. If the vents are blocked by dust, a wall, or a closed cabinet, the device gets too hot and stops working until it cools down. This is one of the most common reasons for outages that fix themselves after a few minutes.
Check where your modem and router are sitting right now. They should have at least two inches of open space on all sides, especially above them where heat rises. If they are in a closed cabinet, inside a bookshelf, or against a wall, move them to an open spot. If they are dusty, use a dry cloth or a can of compressed air to clean the vents — do not use a vacuum, because the static can damage the electronics.
If you move your equipment to a better location and the outages stop, you have solved the problem. If they continue, the modem or router is failing for a different reason and needs to be replaced.
How old your modem and router should be before you replace them
Modems and routers do not last forever. A modem that is more than five years old is likely to start failing — the capacitors inside wear out, and the device becomes unstable. A router that is more than seven years old has the same problem. If your equipment is older than that and you are having outages, replacement is usually cheaper and faster than troubleshooting.
You can find the age of your modem by looking at the label on the back — it usually shows a manufacture date. If you do not see a date, you can call your ISP and ask when they sent it to you, or you can look up the model number online to see when that model was released.
When you replace a modem, you have to buy one that works with your ISP — not all modems work with all ISPs. Call your ISP or visit their website and ask which modems they support, or buy a modem from them directly. Routers are universal and work with any modem, so you can buy any brand you want.
What to check before you call your ISP
Before you contact your ISP to report an outage, do these three things so you can give them useful information. First, restart your modem using the 30-second method and wait to see if the outage comes back. Second, check whether your modem light stays on during the outage or goes out. Third, write down the date, time, and how long the outage lasted.
When you call, tell them: "My modem light [goes out / stays on] during outages, and it happens [every day at this time / randomly / during rain]." This tells them whether the problem is your equipment or the line outside. If the modem light goes out, they will probably tell you to restart it or replace it. If the modem light stays on, they will schedule a technician visit because the problem is on their side of the connection.
If you have restarted the modem multiple times and the outages keep happening, tell your ISP that too — it tells them the problem is not a one-time glitch.
Frequently Asked Questions
Does restarting my router help if the modem light is off?
No. If your modem light is off during an outage, restarting the router will not bring your internet back because the modem has already lost connection to your ISP. Restart the modem instead. Restarting the router only helps if the modem light stays on.
Why does my internet come back on by itself after a few minutes?
Your modem or router is overheating or got stuck in a bad state and reset itself. This is normal and happens to most people occasionally. If it happens more than once a week, move your equipment to a cooler, more open location or replace it if it is old.
Can I use any modem with my ISP?
No. Different ISPs use different types of modems — cable ISPs need cable modems, fiber ISPs need fiber modems, and phone-line ISPs need different equipment again. Call your ISP or check their website to see which modems they support before you buy one.
What if my internet drops only when I am using video calls or streaming?
That usually means your router cannot handle the amount of data you are using, not that the connection is failing. This is different from a complete outage. You may need a newer router that supports faster speeds, or you may need to move closer to the router so the wireless signal is stronger.
Is it normal for internet to go out during storms?
It can be, especially if you have a phone line or older cable. Lightning can damage the line or the equipment at the pole. If outages happen every time it rains, call your ISP — they may need to replace the line or add protection to it.