Here are a couple of common causes for this... You may indeed have a wiring issue between the receiver and speaker(s) - i.e. wire damage causing the conductors to touch each other (look for wire problems at the back of the receiver or speaker(s) right where the wire connects to the device). Also check for physical damage like pinched wire, damaged or missing insulation, etc. The speaker(s) could be damaged (possibly from excessive power/volume levels). If these are not the problem, the cause may be the receiver itself. Try disconnecting one speaker at a time and running the volume back up to see if the receiver shuts off. This may help isolate a specific wire/speaker to check.
Answers & Comments
Here are a couple of common causes for this... You may indeed have a wiring issue between the receiver and speaker(s) - i.e. wire damage causing the conductors to touch each other (look for wire problems at the back of the receiver or speaker(s) right where the wire connects to the device). Also check for physical damage like pinched wire, damaged or missing insulation, etc. The speaker(s) could be damaged (possibly from excessive power/volume levels). If these are not the problem, the cause may be the receiver itself. Try disconnecting one speaker at a time and running the volume back up to see if the receiver shuts off. This may help isolate a specific wire/speaker to check.