The other night using my A10s (I run one for stage, one for SBD) I had a bizarre issue where it seemingly unpaired from my phone, and would -not- re-pair no matter what I tried in the moment. Not sure if it was because I was surrounded by dozens of other Bluetooth devices in a rather large venue or what. Even after the show I was still unable to get it to pair without throwing errors, what *finally* worked was brute forcing it with NFC. By which I mean, I had to initiate NFC pairing at least 5 times before it finally "stuck", at which point it was perfect, again.
Ran into the issue after pairing it to my car for some listening for the first time the day prior, so, just throwing this out there as a cautionary tale, and as a possible fix if anyone else has the same thing occur. I had to Google where the NFC reader was in my phone - you put put it flush against the little NFC Icon on the back of the A10 and it then automatically tries to pair. Wasn't even aware of that feature.