[DutchmenSport]

Not related to your problem, but it brought back a memory. Shortly after we moved into our current house, about 6:30 every morning we'd heard music coming through the fire place. It's a wood burning fire place with an insert and we use it for primary heat in that end of the house.

Every morning we'd hear the same mysterious music. Sometimes it would sound like someone talking (maybe in a garbled are a foreign language, it was never clear, but it was human voice).

I explored everything, roof, attic, outside, check with the neighbors to see if maybe a radio alarm clock was going off somewhere. Nothing.

By 6:40 am the sound would quit. This went on every morning ... well ... for 13 years now. We still have not figured out what it is or what's causing it. Sometimes it sounds like symphony music, sometimes like country, sometimes like rock-n-roll. But never really distinguishable enough to really make it out!

And it seemed like it would do it when the most when there was still hot ashes from a fire the night before. Really weird!

No doubt, you've heard of folks getting radio stations through their electric coffee pots and sometimes from their toasters. I suppose a "hum" could also come from something inside your camper... wires laid exactly in the right position, vibrations, or even sound waves beyond your hearing range causing things to vibrate in a range you can hear!

Or ... maybe you just have a good old fashioned "ghost" or poltergeist. Now that's perfect for Halloween approaching!

But, I think you have something battery powered that is doing it. We had a rechargable battery operated sound bar in our camper for the television. One morning we heard this weird chirping sound. It make no sense what it was. It took about a week to figure it out, as it did it so random. It turned out to be a low battery warning in that sound bar. It wanted to be plugged and charged up.

So, your's might be something similar. What kind of battery operated devices do you have laying in a drawer, or a cabinet? Check them all out. Maybe your phones, watches, or anything.

Good luck.