Android 12 update - battery drains to 0% over night

[haradl]

Xperia 5 II.
I keep battery charge 20-80%.
Had no issues with it.
Updated to Android 12, two days ago.

Now I've overslept two days in a row. 
Phone has drained over night and turned OFF.

(I put the drained , turned off phone on the charger and ... whoops.. no battery care. 100% charge. Android 12 update has taken more life out of the battery the last 2 days than 10 days normal usage with Android 11!)
Please advise!

[Lord_viridis]

I would recommend backing up your files using Xperia companion, then perform a "repair installation"

Once complete, restore using the previously made backup.

Once complete, reboot phone and when loaded, press and hold the volume up and power button until you feel 3 vibrations. Then restart the phone.

This should clear out any errors and will clear any caches made that may hinder the creation of new caches using the android 12 apps.

[Piscie]

Hey @haradl, you can also try the following before the software repair: Tap on Settings - Apps - See all app - Tap on the 3 dots on top right corner - Show system -  System UI App - Storage - Clear cache and clear data - Return back - Tap on Force Stop, followed by a forced restart (Hold the power and Volume+ simultaneously)