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Audio output / Bluetooth problems pls. HELP

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Jan 31, 2014
OnePlus 8 Pro
My OnePlus 8 pro suddenly have some weird problems.
OS : IN11BA no root

I can connect my Bluetooth headphones and sometimes it works for a few minutes and than the phone switch to phone speakers from itself.
I push volume rocker to change but it isn't working.
I unpaired all devices / I reset network connections and cleaned cash from Bluetooth apps. I even did a factory reset but nothing is solving the problem.
I'm trying now for days it's very frustrating.
I searched here on xda and OnePlus community also YouTube and really tried everything I could find.

Should I downgrade to android 10? Is 11 the problem ?
Does anyone have an idea how to solve this ?
Thank you so much.