S55 nav system

Just bought an 04 S55 and the nav system freezes without seeming rhyme or reason. The map is what actually locks up along with the direction (N,S, E, W etc) on the heads up display while the guidance
instructions and current location in the heads up still function. Dealer has given the '30 yard stare' so far. Any suggestions?
steve
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Steve wrote:

Refund.
--
STOP READING HERE!!!!!
DO NOT READ ANYTHING BELOW THIS LINE!!!!
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Did you try cleaning the disc?
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