If the player reboots when you flash the high beams, I would suspect some kind of a wiring fault or a problem with the voltage level in your car. Alternator, battery, voltage regulator, amps drawing too much current, wiring too thin for the juice that's on the wire, that sort of thing.

Also make sure your player has the correct power going to the correct wires (constant 12v to yellow, switched 12v to orange, no blown fuses, etc.).

Regarding the left-lane blockers: Hear, hear.