Reviving an old thread, but this problem continued since 2011, and got progressively worse and by this past winter it was happening 3-4x per day, and then the iDrive would shut down and restart while I was driving. Brought it in to the dealer this week and they said that there was an SIB related to this (SIB 650913). They updated the software (took 1.5 days) and so far so good. They said the SIB solution worked for some cars and did not work for others, so we'll see longer term.
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