first time stereo

I have just recently put a system in a mitsubishi eclipse 2006

clarion NZ409 headunit

2 10" clarion PXW1052 1000watt 4ohm subs

2 sets of clarion SRG1620R 2-way 180watt 6.5 speakers

2 850watt clarion DPX851amp, one for each sub

1 clarion 450watt amp for 6.5

I also have a second batery in the trunk which has all of the stereo equipment hooked up to it. I have never had a problem starting the vehicle or dimming of lights I do however have an issue with the sound system. Worked great for a few weeks but now when I turn it on while driving the subs work for 30 secs and shut off then come back on then off again, the door speakers sound like I am losing a radio station and becomes fuzzy and garbled and also the volume sounds like it is turning down???? any advise or problem solving steps would be great