My iPhone was working fine without complications. I ripped a CD and go to add my songs...but it wouldn't let me. Go to "Summary" under my iPhone menu in iTunes and I see "Manually manage music and videos" is unchecked. I've had this checked previously because I did not have any problems adding (non-iTunes purchased) music. Put the checkmark back in and Apply my settings...and boom. "Erase and sync"... So now, I'm backing up my phone just so I can make a little CHECK in iTunes. This is beyond frustrating. What can I do in the future so this will not happen again? Thanks in advance.