In my newly acquired 2002 X5, the navagation system shuts down and reboots every once in a while. It can resume guidance once rebooted, (after about a minute). I could be wrong, but it seems to be related to hitting bumps in the road, so I'm thinking either a loose connector somewhere, or the CD is skipping???

Anyone have an idea of where I should start to look to solve this issue?

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2014 BMW 328i Xdrive
2011 BMW 335i M-Sport
2008 BMW X5 4.8i Sport
2000 BMW 528i 5sp