iPhone 3.1.3 raised many complaints in Apple’s support forums. Two of most known critical problems are:
- Battery life has got worst with this firmware even this firmware main apsect was to solve battery issues. Phones just loses hours of power and gets hot.
- iTunes playlists are failing to sync properly with the iPod touch. While files will copy over properly, playlists may be empty or simply absent. The glitch is believed to affect only smart playlists, and potentially only those with multiple criteria. Temporary workarounds may include reducing criteria to a single field, and/or deleting and remaking previous playlists.

It is reported that Apple has formally address or fix either of the cited errors.
[Via]
