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Router keeps rebooting itself/losing connection. Red lights along the bottom slowly fade in and out for a few minutes and then back to normal.
It used to happen about once a day when my router was newly installed several months ago but it's happening a few times a day now and within the last 2 hours it's done this 6 times.
Next time it goes down, check if you lose the actual WiFi link. If you don't then it's an issue between the modem/router and your local cabinet and will require an engineer visit. If you do then most probably you need a modem router. Either way, knowing this in advance will help!