Is it in Mono load? If so, and you have been running it for a while, and you could have been clipping, and one of your subs have gone bad finally throwing the amp into protect mode.Check your subs is what I would do.:crap:Check the coils when you pull the subs out, you will be able to smell the bad one soon as you pull the sub.IMO.Then check the subs with a DMM, there is a thread on this forum how to do so.Just my opinion of what it could possibly be rt off the bat.//content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif