Car audio and dying battery?

you probably just need to switch out the stock car battery with one that has more cranking amps, i had the same problem with my truck awhile ago. while i would be driving on the road my truck would shut off on me then i would have to shut my system off just so i can start my truck back up, so i just went to autozone and got a battery with 1000 cranking amps so it can support the aditional power that my system has. the battery i got was around 120 bucks which is expensive for a battery but it solved the problem for sure.