I have a boat that I've installed a Pyle PLCDBT75MRB (40 watts x 4) receiver and two Boss MR6W 180 Watt speakers. Once installed everything seemed to work beautifully for 5-10 minutes while testing. The next day I tested it again and everything instantly shut down after 2-3 minutes of use. I disconnected one of the speakers and it seems to work fine for about 10 minutes again. Now, every time I try to turn the system on, it shuts down within 30 seconds. Battery is fully charged. I did no go out and buy these, they were a gift, but everything is new out of the box. Any input on what the issue is, and a solution?