RCA RT27760: Audio cuts out

Most likely is an intermittent solder connection opening up as set warms up.

without more detailed info, quick suggestion - thermal fault, if all TX audio works when in this fault condition, it may be fair to assume audio IC is ok and check electrolytic capacitors and dry joints.

i'm not the perfect expert in this but did you try removing all speaker,rca,s video, etc from the back and seeing if something maybe back feeding to the receiver. the red light blinking usually means its detecting a short somewhere and it goes in a fail safe mode to prevent more damage. if it stays on with everything disconnected the problem is with something else. try them one at a time to isolate the problem. hope this helps thank you.

Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Your amp is clipping. Try adding a capa A thumbs up would be greatly appreciated if this answer is helpful to you.

you may have fried the amp pre outs in the head deck, try the amps on another stereo

Which lights are lit on top of the amp when you power it up?

Which ones light up during the 15 seconds that it's on?

Are you running a signal sensing system or are you turning the amp on via the remote lead?

Is the signal sensing switch set to on or off?

ya the volume of your source is your issue.
if it is too low, the unit cuts out after 45 seconds or so...
crank up the volume and turn it down on your headset

Could have a loose connection in the audio section or a problem with the output IC . Also does this happen on the RF input and your A/V inputs or just one of these. If its the A/V inputs only your having this problem check your cables .

So you have an EQ and a Pioneer amp you're trying to hook up to each other? And only some Stinger RCA cable works? And when the lightning audio RCA cable is hooked up, it doesn't turn on? The amp isn't grounding itself through the RCA cables, is it? Check your ground wire and make sure it has a clean contact that's free of rust or any paint that might be in the way. Otherwise, the RCA cables should have nothing to do with an amp turning on or not.