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I recently bought my first car, I bought a 2006 honda civic hybrid. the only thing is when I turn the volume up on the navigation system sometimes the audio will just cut off. it usually cuts off after 30 on the volume ***. I believe the two-door speakers and left rear passenger speakers are not working and I plan to replace all the speakers and eventually put in a sub, but before I do any of that is there any possible fix to at least have my audio not cut off. the audio also turns back on once the car is turned to the on position and will go back to normal when started again. Thanks !

 
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Have you replaced the factory radio with an aftermarket? When you turn it up, there is probably a ground wire that is lose, possibly being rattled by bass?. You'll have to do some wore tracing most likely. Make sure all of the ground wires are tightened down and no wires are touching any metal surfaces or each other. Does the audio stop or does the radio completely turn off? I would start by pulling the radio and checking all of those wires.

Edit. Also check the fuse in the radio and make sure that it isn't going bad (unlikely because usually they are either good or bad and not in between but maybe it's lose if there is one in the back of the radio).