Ah. Yes, then in that case, it's highly unlikely to related to the car's wiring. Since you're not doing anything that would jar the wiring or the sled.

There is one other thing it could be that's external to the player: Depending on the kind of static you're hearing, it could be an amplifier fault, which happens to get reset when the amp remote line goes low then high again due to the reboot. The AC/Home test, if it produces the noise, will rule this out for sure.

I'm betting it's a fault that's internal to the player. It may need repair of some kind. On the other hand, maybe it just needs a new hard disk. The boot log might help us figure that out. Oh, also make sure there's not a loose screw or some other obvious thing.

Here's a fun question that might help narrow down the location of the fault. When the noise happens, if you turn the player's volume up and down, does the noise increase and decrease in volume?