Sorry but this has annihilated my note 9.
I have the handset on EE - since I installed the battery life has taken a huge hit. The phone is glitchy and buggy and becoming a pig to use.
This was an awful effort from Samsung
If anyone else had the same experience and overcome it please let me know, I would love to roll back but dont think you can.
In that case I would say contact samsung and see what they say. I know some people have had battery issues, with the battery expanding and causing strange issues with their screen. Give samsung a call and see what they say.