This is a strange one several times over the last couple of weeks I have gone to drive away from home to discover all memories have been lost trip meter /dash clock /power windows and radio settings have all been erased . Then today I was working on a small job and left the cd player working with the van on accessories , about an hour or so later I heard a pop sound as the amps and head unit shut down and found once again all memory settings were gone again . It does not happen when driving {so far} Any clues all my learned friends . "Dazed and Confused "