okay, So i received a replacement Nav last night and installed it temporarily. I upgraded to an '06 version that came with the disk, but burned a 2012 disk a while back so i popped that one in this morning. It looks to be all good now! Got to listen to my tunes and see the newer map style without it resetting or shutting off.
Now my question is - Am I missing anything if I don't update my screen? I believe I saw somewhere that people are replacing both the drive and screen when doing the upgrade.