First find out what is disconnecting. A device can lose its Wi-Fi link to the router, stay connected to Wi-Fi while the internet service fails, or fail to load a particular site. Those symptoms point to different fixes.
Quick checks
When the problem happens, look at the Wi-Fi indicator and try another website. Check a second device on the same network. If both devices lose internet at once, focus on the router or service. If only one device drops its Wi-Fi link, focus on that device and its signal.
Move closer to the router for a short test. Thick walls, metal objects and interference can weaken the signal. If possible, test a wired Ethernet connection; a stable wired link while Wi-Fi drops suggests a wireless issue rather than a total service outage.
Likely causes
Weak signal or interference: the problem varies by room or time. Try a closer location and ensure the router is not enclosed in a cabinet.
Router or service interruptions: several devices fail together, or router status lights change. Check the provider's service status. Restart the router once using its normal power control, then allow it to reconnect fully.
One device's software or adapter: other devices remain stable. Restart the affected device. Check for operating-system and wireless adapter updates from the device or adapter manufacturer. Avoid downloading “driver updater” utilities from unrelated sites.
Name lookup failure: Wi-Fi remains connected, but certain names fail to load. What is DNS? explains that separate step. Do not change DNS merely because the wireless signal itself disappears.
A careful diagnostic sequence
- Record the time of a disconnection and whether the Wi-Fi icon changed.
- Check a second device and, if available, a wired connection.
- Test nearer the router. If that helps, investigate placement or interference.
- If only one device fails everywhere, restart it and check its official updates.
- If all devices fail together, check router status and your provider's service information.
When to stop or ask for help
Do not factory-reset a router without a record of its connection settings: doing so can leave the household offline. If the router is unusually hot, smells burnt or has a damaged power adapter, switch it off and seek a replacement or professional help. If the connection keeps failing after the checks above, give your provider or network administrator the times and observations you recorded.