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I'm also have this exact issue on my Quest Pro with PTC 2.3, I also cant downgrade even with opting out and factory resetting twice.
- Quest Pro controller is getting an offset every 30s that doesn't resolve itself (I have this issue since day one, on three different controllers so it's not hardware related) as before where I was putting the drifting controller in my back a few seconds to make the headset/controller line of sight occluded, then bringing the controller in front my face/the headset, it used to recalibrate after a few seconds. This issue makes the headset useless when randomly one of your controller is multiple meters away from your actual hand...
Note I tried to leave PTC, performed a factory reset : I haven't been rollback to 2.1, I'm stuck on 2.3...
Edit : After thousand hours of VR, it's just today I found a way to force the quest pro controller to reset its tracking : I bring the controller inside a pocket/below my t-shirt for a few seconds, then bring it in front of the headset -> it resets the tracking... At least I can use my Quest Pro without restarting my controller every few minutes