I haven’t had a problem doing backup or updating Android apps. XA2 dual sim running 4.4.0.58.
I’d recommend doing a reflash
I did have other issues caused by either an updated that didn’t proceed correctly or accumulated little niggles with various updates. I did a re-flash and these issues have gone away. The one problem I ran up against was that before the re-flash the file system used Nemo now it’s DefaultUser and this caused some issues with the importing of the backed up data. This thread was a big help. [3.4.0 onwards?] Restore backup fails when restoring notes (here: from Xperia X to Xperia 10 II )