Sub fades in and out randomly

[Loganbowser]

I've had an ongoing problem where my amp will randomly start blinking the protect light consistently until I turn the car off then on. This causes the sub to turn on for one second and off for one second in a continuous loop. The speakers still produce continuous uninterrupted sound though. I have no idea what's wrong I've tried 3 different subs and they all produce the same outcome, it could be the amp, but sometimes I listen to music for an hour straight without it acting up. See video attached for clarification.

View attachment 0614191855(1).mp4

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[THATpurpleKUSH 5,000+ posts]

Where is the amp grounded to? Make sure all of the connections are tight.

What is the voltage at the power input of the amp when its shutting off?