Frequent internet drop-outs: diagnosis and fixes
Contents
Drop-outs are more frustrating than modest speed: a call cuts off, a game disconnects, a video stops. The first question is simple: what exactly is dropping?
Step 1: identify the type of drop-out
| Observation | Type | Lead |
|---|---|---|
| One device loses connection | Wi-Fi or device | Distance, power saving, driver |
| All Wi-Fi devices drop, cable holds | Router Wi-Fi | Interference, overheating, firmware |
| Everything drops, internet light off or red | Line or router | Fibre, ADSL, power |
| Drops mainly in the evening or in wet weather | Network or copper line | Congestion, humidity |
Wi-Fi drop-outs
- Power-saving modes on phones and laptops that turn Wi-Fi off on standby.
- Automatic band switching between 2.4 and 5 GHz at the edge of coverage.
- Interference: microwaves, Bluetooth devices, neighbouring networks on the same channel.
- Too many devices on an old router.
Fixes: move the device closer, give the bands separate names, update, or install Mesh. See improving your Wi-Fi.
Router drop-outs
- Overheating: a router shut in a cabinet or in the sun restarts by itself.
- Power: a faulty power strip or brief power cuts. A small UPS solves it.
- Firmware: some versions have bugs; a full restart often triggers the update.
Line drop-outs
On fibre
A LOS light (or "Alarm") blinking or red means the optical signal is lost. Causes: bent or unplugged optical cord, dirty connector, damaged cable in the building. Detailed guide: red LOS light on a fibre router.
On ADSL
Frequent re-syncs often come from a faulty filter, an oxidised socket or a damp line. See slow ADSL: improving your speed.
Measure your connection now. Start the test
Keep a drop-out log
Before calling your provider, note for a few days:
- The date, time and duration of each drop-out.
- The state of the router lights during the drop-out.
- Whether it affects the cable, Wi-Fi or both.
- A speed test before and after.
A precise log often avoids pointless back-and-forth and gets a faster repair. Send it to your provider's support with a few speed test results.
Sources and further reading
Frequently asked questions
Why does internet cut out every night at the same time?
It may be a scheduled router update, network maintenance or a Wi-Fi schedule enabled in the router interface.
My router restarts by itself, is that serious?
Usually overheating or unstable power. If it continues in a ventilated spot, ask for a replacement router.
Can drop-outs come from the optical cable?
Yes. A bent cord or dirty connector causes intermittent signal loss and the LOS light.
The SpeedFibre team Guides written and reviewed by a telecom engineer specialised in fibre optics (FTTH), with more than 8 years of hands-on network maintenance and measurement. Editorial policy.
Related guides
- TroubleshootingRed LOS light on a fibre router: causes and what to do
Red or blinking LOS light on your fibre router or ONT? What loss of optical signal means, the checks you can do yourself and when to call your provider.
- TroubleshootingSlow internet: 12 common causes and how to fix them
Slow connection? A step-by-step method to find the cause (Wi-Fi, router, device, line, peak hours) and fix it, with a speed test at each step.
- TroubleshootingFibre slow on Wi-Fi but fast on cable: why, and how to fix it
Your fibre reaches full speed over Ethernet but not over Wi-Fi? The real limits of Wi-Fi, normal speeds by device and 8 practical fixes.
- TroubleshootingSlow ADSL: 9 tips to improve your speed
Is your ADSL slow? Filter, socket, extension, sync rate, interference: the checks that really gain speed, and when to switch to fibre.
