Electrical static popping

[Hos]

Hello 👋🏻 

I have an issue that happens at random. There’s a static popping/thud sound from the sub and speakers. Anything can trigger this, such as operating a window or the lights coming on, and even steering the wheel. Sometimes it can be a little crack, and others it’s a big thud from the sub. 

this has only started when a new stereo was installed. I’ve disconnected any wires that aren’t relevant for operation. A simple yet expensive option is to change the unit, but I want to avoid that and see if anyone has experienced this before, and maybe solved it. 
 

thanks!