Chosen Solution

When I press the brake, there is a surge/thump that hits the speakers. At other times, my warning lights on my dash all blink, my radio’s time changes, and my door lock will flip up and down several times. I had my alternator and driver side window control panel replaced but nothing seems to help. Any ideas?

Loose connection somewhere. Double check all of your sub wires / speakerwires both going into the speaker and out of the head unit / amp