I have problems with higher power drain on an Xperia X, too, and have reported that here:
Another bug: call history never loads. Together with the lack of notifications for missed calls (which is an issue ever since new notification design was introduced) it’s impossible to find out if somebody have called.
It’ the same with XA2 Plus Dualsim (connected with one sim).
Now that the localization round for SFOS 4.2.0 has started, do you know whether the release notes for the next version are already available, even in WIP form ?
the release notes are only published once the EA releases are there.