Your drive is finicky and most likely needs a real DVD... I think 2007.1 and newer is fine with the v32 update.

$70 for a legit 2007.1 High DVD: 2007 BMW 5 , 3-Series M3 Navigation DVD High 2007.1:eBay Motors (item 170331896791 end time Jun-12-09 10:48:32 PDT) (be careful with this auction... The picture shows CCC (not the high version), but the auction says
high". Verify that the seller has the wrong picture up...

2009.1 High is the latest. $200 from NAVTEQ Maps and Traffic

Good news is... If you buy the DVD and its toast, you can easily sell it for what you paid for it... Actually, you'd need it for your replacement MKIV...