Are you using a copy of a map disk or an original? If you are using a copy, that might be the problem. The MKIV hates DVD copies, and a copy will cause the nav computer to freeze and to reboot. It is a common problem with the MKIV. Try using the nav computer with an original map disk and see if that solves the problem.

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input