Well I thought this was interesting. The wireless falls over here in the caravan every now and then. To cut a long story short it’s when we run the microwave to cook things, yep that simple. 
I was reminded of the chance of that when I remembered years ago reading that a radio telescope was picking spurious signals randomly. It took them a fair while to work out that it was when the microwave in their kitchen was stopped before the timer ran out. Weird, but it helped me work it out.