I have a weird problem. When I cut my car on many times my sub woofer will not start playing sound. The amp has power and it's light is on. Sometimes it takes a few minutes and will start up on its own. Sidenote â€" The audio input is through a high-level converter to pre amp output. The big catch is that if I ground out the speaker level input connections for a second the sub starts to play with no problem from then on.