They said, “it still not fix some old issues” like battery drain problem, Wi Fi connectivity issue didn’t solved in i OS 9.2.1.
Posters to a thread on Apple's discussion boards report that afflicted i Phones will sync with i Tunes for a period of time before stopping completely, generally after deleting songs.
User "Scott" writes: "My issue seemed to be triggered by attempting to delete some songs on my i Phone.
Update: If Wi-Fi is sluggish, not working or disconnecting after upgrading your i Phone or i Pad to i OS 8, then check our post for some tips to fix the issue: ➤ Having Wi-Fi problems with i OS 8?
Here’s how to fix it Let me know if you’re facing any problems after upgrading to i OS 8.0.2.
One user, "Keven-77," wrote: "I just noticed something.