I live a small, low-density town. Within 50m radius, there are 10 houses, no offices. Normally, I can see ~8 APs on 2.4GHz, one of which is ours. They're well spread across the band. It also functions at 5GHz, but obviously, I can only see ours within the house.
All in all, a fairly standard, low interference scenario.
But for the past couple of months, every so often 2.4GHz dies. And I mean dead. Our 2.4GHz-only devices drop off the network. When I scan from laptops, phones, dongles, I can only see our 5GHz network. Even the neighbours —who between them normally cover the entire spectrum— have dropped off the face of the earth. This lasts for minutes... And then everything Just Works™ again.
This is low-density population. I don't think our 80yo or middle-aged family neighbours are likely to be using a for-purpose Wi-Fi-blocker but that's really how this presents. Like a high-interference sustained fuzzing of the band.
The only change to note is a set of roadworks that has slowly been moving past our house. Temporary traffic lights might have causes some interference and I'd have bought this when they were right outside but they're about 100m away now.
So I'm stumped. Any ideas? Assuming this is interference, is there anything I can do to track it (without spending billions)? Even if that's just registering that there is interference coming from somewhere.