Radio stops playing

[WallaceB]

On the way to work this morning I hit a bump in the road and my radio stopped playing. I was listening to XM and the touch screen was lit up with the correct channel info but I had no sound. the volume tabs on the steering wheel did not change the volume and neither did the knob on the radio. The touch screen finally let me change from XM to a local station but still no sound. When I got to work and shut down the truck I got out and set the alarm then I got back into the truck and started it. After punching a few buttons on the screen the local station came back on and the radio is working now. Just bought the truck yesterday, it's a 2107 GMC Serria Z71 and i really like my radio going down the road. Has anyone else had a problem with the radio cutting out after hitting a bump in the road?