dar951I don't know if this is the same as what you are saying but I've recently realised that fingerprint actually only unlocks the phone & so depending how long you have set it to 'sleep' for after turning the screen off, if you turn it on before the time is up then the fingerprint won't turn it on, only the power button!
Same here, really starting to regret updating to Android 10...
Sometimes the phone won't respond for 3-5 seconds when trying to open an app.
Sometimes unlocking the phone with fingerprint just doesn't work, screen stays black for 5+ seconds while finger is on sensor. Then when I try to open the screen with the on-button, the screen flashes on and back off immediately. Really frustrating.
This used to be a really good, fast and fluid phone. Please investigate this @Anders_ASUS