A few months ago I started to lose my home WiFi connection. Sometimes the SSID would appear but PCs couldn't connect, sometimes the SSID would not even appear. Those symptoms suggested RF interference was to blame and I tried turning loads of stuff off to isolate the source. I also noticed the problem was largely confined to the evening so hypothesised that the neighbours were to blame. I also tried a new wireless router. Nothing seemed to work.
Fast forward to September, when I went on holiday for a few days, leaving my daughter at home. On my return (in the evening) her first words as I walked in were "the Internet's gone". She did some googling and came up with the most unlikely cause - my recently acquired car's alarm system. Specifically the internal movement sensor. So I turned that off and the network returned. Subsequently we had friends for dinner. As they came in my daughter came down and announced the network was down again. Same problem, same make of car.
So, if you have WiFi problems and a Mazda car, use the 3rd button on the keyfob to turn off the movement sensor when locking your car in the driveway. (and if parking outside Starbucks or any other popular WiFi hotspot).
Looking elsewhere on Google I found a post that suggested the interference is only on channel 9 so only afffects WiFi channels 6 to 11 (Wifi on channel N uses channels N-3 to N+3 which is why most routers use channels 1, 6 or 11). I might test that later.
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