OnePlus 9 and 9 Pro Android 13 completed, now what?

After upgrade to 13, my phone start to have 2 main problems.

1. On and off screen turn black out and the only way to bring it back is power off and on
2. Signal is also turn off and on by itself.

Anyone experience these? And anyone know the fix?

how long ago did you download 13? if its been a week roughly that should be enough time for your phone to settle in with the update stuff.

are you by chance running a screen protector? and for the screen going off and on randomly...is this while its just sitting there or while on a call or something?

I updated few days ago, not sure what date but for sure it is less than one week.

I don't have any screen protector app running. The first time it went black I was in the middle to Settings Gestures & motions. The second time was in Facebook, and the rest was sometime just sitting there without any active app then reboot itself.

so its a bit like the screen time out time has been changed up on your so mid use its just going black?

It is something like that except before it turns black screen. It is flashing for a sub second then turn completed dark.

running power saver mode by chance? wouldnt be the first time i have came across a device that had power saver mode going a bit more aggressive than it should be. if you are running it turn it off..restart the phone..ensure its still off..then test it for a bit and see if things improve...worst case it might need a factory reset...but before that you might even switch the phone into safe mode in case its being caused by one of the apps you have downloaded on your phone..also not unhead of.

Sorry I have power saving is off. Factory reset would be the last resort and I think unless I can revert to before upgrade or unless the new fix is coming out, the problem still will happen. Also, I don't think it is app the causing the issue since the first time it happened I was in system setting. 

Thanks for suggestion anyway.

It's getting worse that my phone will reboot itself by just sitting there then reboot again and again. I finally couldn't take it anymore and did the factory reset then copied data and app from the backup. Once it finished and I was in the middle to config then it happens again turning black screen then reboot. Then I did another factory reset, this time just started from scratch and painstakingly installed all apps and setup one by one. I thought this would fix the issue. But NO!!! It happens again and again of rebooting itself after few hours of using. I concluded this definitely a major bug for the Android 13. So disappointed ever since Android 12. Now I am ready to jump ship to the iPhone