Hi @cattycat53 1.What's your current firmware version? 2.Did you notice a battery drain after recent updates? 3.You can try the following: Charge your device to 100% before going to bed -> Put your device in flight mode and note the time -> Check the battery level in the morning and note the time again. Report back with your results.
I'm experiencing similar problems but for Android 11. I'll never go back to Android 12, it absolutely murdered the battery of my Pixel 4a and I had to downgrade. I'm surprised to see issues on the Zenfone 8 with Android 11 though. It's only happening for me while the screen is active. The battery life is decent while the phone is idle / screen is off.