I just had a very pricey system installed in my truck. The shop actually kept my main system stock because it’s pretty nice and works for now and they were too busy to do it all. They just installed a truck sub box and subs and an amp. There is also a little knob to adjust my sub volume. After one day of use the subs now cut on and off. I don’t know why. If the volume is barely on they stay on, but if turned on a little higher they cut in and out, and if the volume is turned up they stay off and pop a little bit. The shop doesn’t even want to look at it. I can’t believe it, one day after purchase and install from them. I’m not very handy. Can anyone help me figure this out?