I purchased a 2009 335i x-drive on January 15th. It does not have i-drive and has the factory radio. When I started my car this morning I lost all power to the radio, screen completely blank. I restarted about 3hrs later and radio powered up. I understand from other BMW blogs that this seems to be a common and repetitive problem (once it starts to occur) that BMW hasn't figured out a fix for yet. Anyone else experiencing this problem and anyone know of any fix for it?