being professionally installed it should be fine. if anything i would say take it back to them and get them to find out what is wrong and fix it since they were paid to put it in. JL makes quality products so i doubt the amp has any flaws to it, but that could always be a possibility. there could be numerious reasons for shutting off. shutting off is a way of protecting itself which would lead me to believe a wire is exposed somewhere or an ohm load isnt right. when does it shut off and how often does it do it?