A few years ago I was hunting with Mangoave Jim and he hexed my machine! (Jim-this was the day of the psychotic lady) For some weeks afterward I'd get this intermittent interference. It would sound like an engine running for a minute then abruptly stop for five or ten minutes. After a few weeks everything went back to normal...until last week...as I was pulling some nice coins I had to wait every five minutes or so for the engine running. Thankfully it seems to start around 7am...near the end of my hunts Could this be a planes and their flight paths change? It's not my cell phone. I know what that sounds like Thanks!
PS I'm an hour from Logan and a bit more from Westover Air force Base.