Not a clue. I hadn't used it for a long time and am thinking a lower ppower state might have introduced some hiccups. Interestingly tech support was real interested in knowing if I had been upgrading the firmware or uploading maps (I hadn't) which makes me lean toawrds a software rather than hardware problem.

They offered me 40% of MSRP for either of 2 new units since they don't fix out of warranty products. Still mulling that over.