I have a recently purchased RS 2664 RCA shelf

I have recently purchased a RS 2664 RCA shelf system. I purchased a second set of speakers and wired switches to play either set at a time.
System performed superbly initially, however, after about 30 minutes, the receiver shut down.
It didn't effect my circuit breaker, but merely the reciever. After disconnecting all the add on speakers, it now shuts down minutes after turning it on.

I tried unplugging the system and it responded with the initial introduction on what the system does without turning it on, but subsequently shut down when I did turn it on.

The initial cause of the problem may have resulted from crossed wires at splices, but all of those are now disconnected.