P1571378933968 , via OnePlus 7T , May 3, 2021 : 1. Battery Drain happening way faster than earlier. I have wifi on all day and 10hours screen time. Earlier 2 charges upto 80% would take me through day but now it needs a third charge cycle. 2. Whatsapp crashing and not able to directly capture photo from Chat's camera feature (like you are messaging and they say send a photo, I am unable to do) so I have to go to Camera click and then upload to Whatsapp. 3. Performance Lag - - It ain't smooth any more - apps crashing, loading time more - recent app drawer sluggish 4. Overall experience had gone bad with this update. It doesn't seem stable at all. 5. I heard, downgrading to Android 10 would delete all my personal files and apps with app data (can't afford that), simple backup and restore won't work. @OnePlus developer and OS team request that someone must look into all these issues and resolve at the earliest. This version update has spoilt the whole Oneplus smooth kind Oxygen Experience for all the users who upgraded. I will keep adding bug/ problem faced as and when I keep experiencing. *Not going to downgrade (can't do, no option with me) So I will stay and suffer and give you guys feedback. ------ + ----- + ------- Update : 06 may 2021 6. I can't located my call recording through file manager I need to transfer it to My computer for sharing. 7. MX Player app crashing after playback of video/ audio for 10-50 seconds, automatically. Everytime. Tried cleaning cache nothing seems to be helping. 8. Gallery is buggy, very slow preview load and certain images not seen, no thumbnail and deleting selected files (say 10 images) takes time unlike earlier.