I had the same issue with my car. There is a recall for this issue but mine missed it by a couple of days. Apparently the main red cable from battery to fuse panel has a bad connection which causes sudden power loss to all components.The cable has to be cut and re-connected from about 1 foot in. Dealer called BMW and they agreed to pay for labour and i would pay for parts(about $40.00).
Hope this helps.
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