...yeah, I suspected that it was the burned copy that was causing issues, I'm going to try a better brand DVDs and see what happens.


I was just surprised that after upgrading the SW in the MK4 to v.31 the lock-ups caused a "total failure" of the SatNav
With SW v.29.1 in the MK4 the lock-ups only made the the SatNav "freeze up" from time to time.

But at least "re-setting" still works fine and the SatNav comes back to life.

Thanks for all the help and replies!