Over the past few months, I have been having frequent WiFi dropouts with an HG635 router. The router frequently stops broadcasting both on 2.4GHz and 5 GHz signals, this happens for a few minutes at a time, Wired connections are not affected when this happens. I have used a WiFi analyser and there are no interferers within range.
When you used the WiFi analyser, was it when the problem occurred?
You misunderstand me, I know the WiFi analyser won't cause the WiFi to go down. What I meant was, whilst the WiFi is down, have you checked it with the analyser at that moment in case other networks are present at that precise point that overshadow yours?
Without seeing a screenshot this is very difficult. What channel are you & what channel is the interfere on. What bandwidth are both of them using?