Thanks for the advice, guys!
As mentioned above, it was 100% user error, and I completely own up to that. I treated the amp like feces, and killed it dead. I was pushing more than rated power, on a clipped iPod signal cranked to full on both the iPod and headunit, with amp gain about 2/3. The signal was probably more of a square wave than sine, to put it lightly. Plus, it was mounted to the port during comps (with no isolation). So yes... asking for it.
In the words of Dr. Weird, "This time, will be different!... More Corn!" It'll be mounted on an isolated amp/battery rack, on rubber bushings, the input signal will be clean(er), and gains will stay at rated (gets warm but not hot). Thanks for the constructive input, it's refreshing to get that on CA.com