Why does my Samsung Galaxy Appeal SGH i 827 sporadically stop sending and receiving text messages?

A

AC Question

I have a samsung galaxy appeal sgh i 827 that works sporadically

This problem usually only happens on weekends. There is no difference if I am in a Wi-Fi area or different locations. It stops sending and receiving text messages for periods of days and every once in a while it doesn't make or receive calls. I am using AT&T with a 2yr contract, not straight talk. Can anyone tell me why this is happening and how to correct it? The phone is only about 6 months old and has not been damaged in any way. Thanks, Lisa
 

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