I upgraded my Galaxy Tab s9+ to One UI 6.1 and my keyboard and mouse started having problem.  My tablet can only connect to one of them, whichever is first. I can work around the problem by unparing and re-pairing, but then the problem is back in the next session. Would be nice if Samsung can confirm this bug and let us know a fix is being worked on. I know others have the exact same problem. Someone reported Bluetooth version 3 worked, but not version 5.  That's not an option for me as I can't choose on my devices.