Why is my bass knob power light flashing

[tac2137 2]

I've had my subwoofer installed for just over 2 years now with no issues. Now when I start my car (No music playing) The power light on my bass knob flashes and I can hear my subwoofer slightly thumping. I've checked the ground and the power cables but can't figure out what causing it. The clipping light doesn't flash red, just the power light. I attached a video of this. You cant hear the thumping because its very low. The amp I'm using is a Sundown SAZ 1500D and I'm using the bass knob that came with that amp. This issue will happen almost every time I start my car but last week it stopped for about 4 days and now its back and even worse than it was before.

Edited November 21 by tac2137