That is a common issue with the MKIV. As a general rule, the MKIV hates reading from copies. Some folks have not had problems, but on the other hand, many folks have problems with copies. You are probably in the "problem" category.

Search the forum, and you will find other similar posts. I used to try to use a backup in mine, but it kept crashing the nav computer, so I gave up and went back to the original DVD. I have not had a crash since. (I tried burning with different media, different copy programs, and different speeds and never found a working combination for mine.)

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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