Help Anyones Fascinate Jump into Silent mode???

[Brijadyn]

My husband and I both have Fascinates. His phone has gone into silent mode twice today for no apparent reason. The first time it happened to be honest I didnt really believe that he did not do it by accident. Then it just happened again while we were watching tv. He looked down at his phone and the volume was all the way off agian. Its like one min its on and then the next min its on silent???? Has this happened to anyone else????