I have been going through my contacts and entering them into my iPad. After entering just 20 apps it won't let me add another. When I try to it will let me enter the information but the button that says "done" does nothing. I tried hitting the cancel button too and that one won't work either. I have to exit the app completely. Is there any way to fix this (preferrably without losing the contacts I have already entered)? Do you know what could have caused it in the first place?