I have only had this receiver for less than 12 hours, and now it does not respond to the remote.

I have tried changing batteries, although the remote does flash when I press some of the buttons, and also unplugged it from the mains for a few minutes. the receiver still doesn't respond and it is stuck on the same channel for about 4 hours. I cannot do anything except to turn off the receiver and back on again.

Is it faulty, or is there anything else I can do.