try to reset profile (if u'r still running stock rom) what service provider do u have? sprint? verizon? someone else?
u can also try manually updating your prl to one of these (not quite the latests for everyone but its worth a shot)
http://corolada.com/prl/
save to phone memory, dial ##PRL#, enter your msl unlock code, point it to the new file, click ok to update, reset