for my Xperia 10III, 4.4 => 4.5 did the most damage of any SFOS upgrade ever.
- mobile data works randomly, about 25% of the time (it seems the wrong ip -6 route is selected randomly)
- android support is MUCH worse:
- some apps dont work (e.g.: element
- sdcard is randomly mounted or not (storage not found errors occur frequently)
- storage framework changed or something and now i cant get access to books in coolreader not on sdcard, and sdcard fails to mount half the time
- CPU usage is 100% for media service for 40+ hours, presumably scanning my sdcard even though i have it marked not to. never happened in 4.4
- notifications (like SMS alerts) randomly dont happen (restarting ngfd fixes it when it happens, which is often)
- bluetooth just doesnt work at all. service wont start (havent debugged this one too much yet)
there are a few other problems too, like missing packages and dependencies for things i use, too, but nothing that breaks usability so much as the above 4 problems