In a way the problems are related - the Mk.1 popped the speakers because the unit powered down the amp remote at the same time as the rest of the player. The Mk.2 fixes this by powering down in a controlled way (since it has independent switched and permanant power inputs).

The problem with the Mk.2 occurs in a few vehicles which glitch the accessory line with a large (50V+) negative spike. This crashes the power control PIC and the controlled shutdown does not take place - hence the pop.

Rob