I have the exact same problem, both on my Pro5 and Pro3.
Bluetooth Issues Since Surface Updates - 5 August 2021
The Bluetooth on my Surface Pro (5th Gen) has not been working properly since the Surface Firmware Updates this morning. I have to restart to get it to work and then it only works properly for about 5 minutes. I have tried rolling back and reinstalling the Marvell driver. Also the Bluetooth troubleshooter doesn’t fix it. Running that troubleshooter causes Bluetooth to completely stop working. Will you please fix this urgently as it is a major issue for me?
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Surface | Surface Pro | Network
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Anonymous
2021-08-28T18:17:57+00:00 -
Anonymous
2021-08-29T20:04:01+00:00 I've decided to wipe the machine and see if that works. It seems to have worked for the other guy.
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Anonymous
2021-08-29T21:36:07+00:00 Wiped and reinstalled, all was well until 30 minutes later, when the AVASTAR adapter died - again. The nuclear option did not work for me. Back to a corded mouse.