System Issues

[LoweredHzLyfestyle]

So today I started having issues with my 4 channel amp. At high volumes the amp cuts out on goes into power protect mode. What's weird though is that it only does it in really heavy bass. Yesterday I retuned my sub amp to get more power to my sub but my system was fine for all of yesterday and most of today. Only the 4 channel cuts out under heavy bass. My sub keeps playing like everything's normal. The share a single power wire from the front that splits in the rear and a single ground that's in the rear and splits in the rear. I took all the wiring off the amp and put it back on and checked all the power and ground connects and those were good. The voltage is holding steady at 14.4 and all 4 speaker were about 3.8 ohms. The system is in a 2001 Honda civic and the equipment is as follows:

Mechman 240A Alternator

XS Power 5100

Hifonics Brutus 1616.4

4 Rockford Fosgate T1650

Hifonics Brutus 3016.1

Sundown Zv4 15"

I'm completely lost. Any help would be amazing