Hi etlsport..
Reviewing your question & the descriptions of the problem with your audio sys what could be possibly happening is that one of input chips is over heating & is about to say go go bye bye........
When the input chips go above the regular temp the processor unit as safety precaution shuts down the entire system to prevent a major damage.
Now,i'll highly suggest you to have the head unit checked by an certified tech.
If you are familiar with an multimeter tester you can check the current fluctuation drawn one the + 12 cable,the ground cable,the remote cable & continuos yellow cable for any sudden high/low current draw.
Now if this only happens when you raise the volume & play your head unit for long periods of times have in consideration that the inner side of the dash board retains huges amount of heat from the engine compartment,worse if the heater is on,the laser lens begins to fail while playing your CD's,the head unit's chassis temp goes high tough.
By the way,check the wiring harness,RCA cables & connectors for any cooked insulator;Another thing you can do is play the head unit outer the dash & use your finger tips to test the temp at the heat dissipator shield,if the temp is quite high then focus on that issue.
Hope those tips are helpfull
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