bass cuts at high volume?

i gots 2ga. power & ground wire (power has 80amp fuse)

3 hifonic 10s, 900 max 450rms, 2 ohm DVC(wired series parallel @ 1.33 ohms) in a vented box

power akoustik 2000max 1200rms @ 1ohm mono (two 40 amp fuses)

the first 24 hours it was fine, but now when i turn the bass up, the subs quit until i turn it down, or restart cd player. i can hear a clicking sound in the amp when this happens ( but the protect light on amp never comes on) and a scratch sound from the speakers for a split second before the go off(sounds like when you touch a speaker wire to a speaker) are the speakers shutting down or the amp, and why???

i thought maybe it wasnt enough power??or something so i did this

hooked up 2 of the speaker @ 2ohms (left one out)

and the amp is 900rms @ 2 ohms

thought it would be perfect, but it does the exact same thing??? im starting to think my amp is a piece of junk

any ideas why my subs shut down??? i cant figure this out, and like i said, it worked fine the first day...

The protection light may not come on when the voltage drops too low for the amp to play.  If you do not have a meter, shorten the ground wire, make sure you remove the paint from the chassis of the vehicle where you attach the ground wire.  Check the connection at the battery and also inspect the fuse and fuse holder at the battery.  If it has an AGU type fuse, replace the fuse.  Those fuses are famous for melting the solder off of the connections under the cap of the fuse.  It looks fine but it is not. 

The protection light on most amps should be renamed, It's too late, your amp is already broken.

yeah i scratched all the paint off . ive checked all my wiring 2-3 times. checked my fuses, but i WILL replace the AGU ones (makes sence b/c i didnt do it at first) AND ill shorten the ground..one more thing the amp booklets reccomends 4/8 guage power wire (heavier if planning to add more amps) i ran 2 guage(dunno if that helps) also i had no RCA hookups in back of cd changer, had to get the converter kit & tap into speaker wires...lets say it is the volt thing....what would i do to fix it? is that was a capacitor is for???

A cap will not fix your problem. 

And yes that was just for you BigJohnny