Infinity Bass link keeps cutting out.

I have just installed the infinity bass link in my 2001 dodge ram. I tapped into the rear back speakers first and used the line level inputs. the sub and amp combo powered right up and sounded great. after about 2 minutes the sub cut out. it would come on again when i would turn the radio (stock) off and on again and cut out after about a minute. I then decided to tap into my front speakers as well as the back which took about a hour and a half and still the same thing is happening. looking for any kind of advice here please help.