About 2-3 times since last August, neither the top view or rear view turn on. Twice was when I pressed the button to show them off. The most recent time, cycling drive/reverse fixed it, IIRC. In all cases it worked the next time I needed it.

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Richard
Sir Snaps-a-lot, 9 Time Dragon Slayer (54 runs!)
2011 X5 50i Alpine White, Biege Nappa /Lt Poplar M Sport
2009 Z4 35i, Black Sapphire/Ivory-Black/Anthracite

Gone but not forgotten: '08 550i, '06 X3, '06 650i, '02 M5, '99 540i