Hey, for a few days my battery gets drained quickly too.
I suspect thats an issue of the Systemupdates... My Phone told me a few days ago, that it is outdatet and needs a firmware upgrade. I dissmissed it because i thought it would try to download android 12, which obviously wouldnt work that way.
I guess since then it tries to download android 12 in the background and that screws my battery and datausage.
Sadly there is no option to change anything update related in the settings.
please fix this, a love this ROM