Amp goes in protect mode when I turn the volume up?

I'm really frustrated trying to figure this out. I have 2 md sound 12's. 2 ohm, dual voice coil, on a kicker zx 750.1 the speakers are wired at 2 ohms because the amp isn't 1 ohm stable so I can't run the subwoofers at 1 ohm. I just hooked everything up, and it sounded good, but when I turn my volume up to about 25( when it really starts hitting) the amp goes in and out of protect mode, and sometimes the speakers will make a ticking sound. Like the sound iPhones make when you text. I can't figure this one out. Any help would be greatly appreciated.

Volts probably drop too low. Same thing happens to me with my jl audio hd1200 and 12w7 i can't cut the gain up a little over 3/8s of the way and cut the music up. The amp started flashing red and green when i turned the gain up and started blastin the music then i cut the music back down and it went back to green. I looked at the manual and it said when it does that the volts drop down to 8. Thats terrible. You may need a new alternator and batteries or a battery and do the big 3. I'm gonna get all that soon. Cause it sounds crazy when it was cranked up and i feel like i'm missin out lol