I've recently installed my Empeg in a new (to me) vehicle, and it seems to be exhibiting some of the symptoms of the negative spike bug (forgetting song position, going straight into full off). This has me confused, as my player is a Mark 2a. Is it a known thing for the Mark 2a to exhibit the bug even though the diode that is supposed to solve the problem is already installed internally? Anything I can do about this?