Uhoh! iPhone froze twice in a row

[$tevie]

Mine's been doing it. It used to seem it only froze when it was checking for email, but now it is happening more and for no apparent reason. One day it was totally frozen, all I could do was power it off (which ended up solving the problem as it happened). I've got AppleCare so I am wondering if it is time to inquire about this. I'm interested to find out that it isn't just this one.