Hello,
From my side, I#d like to say I also experienced the bluetooth problem mentioned by @Giedrius and, before taking the drastic decision of updating the kernel, I ran sudo apt-get update, after verifying that patchbox update was already at the latest state. In my case, there were a bunch of libraries that got updated and, similarly to @mistymountainblow, libbluetooth3 was among them (though not bluez). That seem to have done the trick for me: no drops so far. I get now:
patch@patchbox:~ $ apt-cache policy libbluetooth3 libbluetooth3: Installed: 5.50-1.2~deb10u1+rpt1 Candidate: 5.50-1.2~deb10u1+rpt1 Version table: *** 5.50-1.2~deb10u1+rpt1 500 500 http://archive.raspberrypi.org/debian buster/main armhf Packages 100 /var/lib/dpkg/status 5.50-1.2~deb10u1 500 500 http://raspbian.raspberrypi.org/raspbian buster/main armhf Packages