Axxerra Radio/Nav issue

there is a main wiring harness plug on the back of the axxera that may not be fully plugged into the unit until it locks in causing power glitches that lock it up. there is a yellow wire on that plug that should have power to the radio at all times or you will lose all the settings and stored stations every time you power it down. a red wire on that plug goes to the ignition switch or they may have it wired another way so you can use it when parked. it could be a bad ground on the radio causing the lockups. or your other power problems your describing my have something to do with it.