Has the phone been turned off since doing the update? If so, you can try doing a hard reset by holding the home and sleep/wake button at the same time until you see an Apple logo. This will often reset issues like this. Lastly, you can backup to iTunes or iCloud and then restore the phone as new. Test the phone and if the problem has gone away, restore from your backup to get your data back. Hope this helps.
It really gone for some time, but now come back big time! wild iPhone! Apple please HELP