So it’s actually working now for me, but I did nothing in particular…
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I connect via ssh and checked the bluetooth version with below 2 commands:
systemctl status bluetooth
bluetoothctl --version -
Then, I gave up and let the box running idle for several hours.
When I came back to it, to my surprise bluetooth was stable and all my devices were listed correctly. I then was able to connect my remote via bluetooth and it’s now working flawlessly for almost 24h so far.