recently i've had my sub cut off after a period of time while in use. i found out that the terminal connection the inside of my speaker box to the outside was faulty so i hardwired my sub to my amp and it worked. but now my sub will only play after i've started my car and if i keep the volume relatively low, or if the sub isn't in heavy use. i've recently ran new rca's from the back of my head unit. My amp has been apart a few times from when the metal clip popped out of the rca terminal because the old rca tip broke off inside and pushed said metal clip out. I don't know if the loss of heat sync paste from taking apart the amp has anything to contribute to the problem or not. also my power wire and ground wire aren't as heavy as they should be and my ground wire is grounded to the battery, i don't know if any of this has potential to be the cause of my problem but maybe it helps.