Sounds like software gremlins to me. Remember you're basically driving a big PC on wheels when it comes to the 6 series.
2012 650-xDrive Convertible. Titanium Silver Metallic - M Package - Driver assist package- Cold weather package - luxury seating package - Bang & Oulfsen system.
2008 650 Convertible 6 speed manual
2004 645 Convertible 6 speed manual
1994 540 6 speed manual