Yes, this is a chronic problem. Search on keywords like "lock" and "freeze" and you will find numerous examples of MKIV computers locking up and rebooting when they are using non-original map DVDs. I have given up trying to use a backup in mine, and I only use my original now. Apparently, the MKIV is extremely sensitive to copied DVDs.

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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