After 20 mins my speakers go insane

I have two directed sx 1200w 12's being pushed by a rockford punch1600w amp that, after alittle while of me playing them at cruising level they start producing a fast and hard type of distortion(for lack of a better word). It sounds like a relay reseting at 50 times a sec and is very hard on my subs. My front and back speakers are on two other amps and do not make the sound. I put a toggle switch on my remote wire because killing the system is the only way to stop it. After turning it right back on it works fine for awhile and then something trys to muder my subs again. I have a kenwood 280w amp for my front speakers and a crossover using the same remote wire. I put a relay on the wire help it out and have removed it and it is not the problem. I moved my remote from my pioneer deh-6500 because another installer said that some pioneer's have a remote wire problem but it did not fix it. I tryed the audio signal from the radio and have unhooked my crossover inputs for the sub's and that didnt fix it. I would unhook the crossover outputs to the sub but I cant reach them while im driving and dont have it on long enough while its parked. I am hoping for it to be something other then the amp Any Ideas on this? Jeremey1000 Has Spoken

motorboating???

I dont think thats the problem. I exceed the iasca's recommended minimum wire gauge size with 2 gauge and I know its rather larg but a 8 gauge for my remote(lot of extra at the shop). But just incase, can motorboating still happen at low volume levels?Jeremey1000 Has Spoken

Not usually. It does sound like a voltage problem to me, though. Test the voltage at the amp power/ground terminals when this occurs. Make sure all connections are good, especially the ground if it's seperate from the other amp.My ex once told me I have a perfect face for radio.

To me it sounds like a bad ground that has manifested itself into a problem in the amplifiers power supply. In my experience, Rockford amps need the absolute best bloody ground that you can give them. The grounding sticky I developed was in direct relation to Rockford amp problems due to bad grounds. Go over that ground again. Turn the gain down on the amp as well if it is just that little too high. How hot is the amp when the subs start to motorboat?Top Secret, I can tell you but then my wife will kill me.

It get's hot but more sometimes than others. I have got two channels pushing 2 ohm loads so I built an amp rack with 2 fans doing a push pull cooling hoping to chill it out alittle bit. Last time I checked the ground it had a value of just over 1\4 ohm. That should be considered a good ground right?Jeremey1000 Has Spoken