First question... is your map disk an original or a copy? If it is a copy, try the original and see if the rebooting persists.

Reboots are often the result of the computer having difficulty reading the map disk.

__________________
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