Yeah this is actually a thing and I thought I was imagining it for ages. Did a session at a supposedly haunted farmhouse in Suffolk last year and my recorder kept throwing out these weird bursts about 30 seconds before my torch started flickering. Happened three times in the same room so I dont think it was just interference or a dodgy battery.
Not sure if the static is like a warning or if whatever is causing the activity is the same thing affecting both bits of kit at once, if that makes sense. Someone told me its electromagnetic but honestly that just moves the question one step back doesn't it.
Anyone else noticing a pattern with the timing or is it totally random when it happens for you? Would be good to know if people are logging the gaps between the burst and the event, proper data would actually be useful here.