I have an iPad Air Gen 1 on a swing arm in the kitchen. It's pretty much never been used off battery. The battery seems fine. At first thought it was because all the memory was used up (literally, zero bytes wer available for storage) so I cleared 16G. Nope. Didn't fix it. Rebooted. Nope. Didn't fix it. It went a way for a while but I can hear it's back agaijn. It's a really fast Bedoop Bedoop Bedoop sound every 1/4 second or so.\\If I unplug it the sound goes away.