I have a Tapo C120 for a few months now, recently I transferred it to different location facing a busy road. I just noticed that it had been recording garbled audio, I don't know if I would describe it as static-y but you know the sound of playing CDs/DVDs in the past that had a lot of scratches on them and the TV would show distorted square-ish images making high pitched distorted sounds? That's the exact sound my C120 is recording. Loud voices are recorded normally, but normal conversations and even the sounds of vehicles passing by are really distorted. I checked the footage prior to the location transfer of the camera and it also had the same issue, albeit milder because the prior location was enclosed and a bit farther from the road.

I've already tried rebooting the camera at least 5 times via the app - no improvement. I also tried checking the mic hole for debris - no debris and no improvement. 

I have 2 new C120s and I don't think they have the same issues despite having the same hardware and firmware versions.