On and off at least a few times a week I am unable to make or receive phone calls and texts, this can last from minutes to hours. There seems to be no rhyme or reason to why this is happening. I can be in an area where I usually have great reception and the phone will say "no reception". People trying to call me say that they get a message that says that my phone number is not in service. Does anyone else have this problem, and if so do you know how to fix the issue?