I had a weird problem like that with my E92 335. Driving along car started to feel odd. Passenger airbag light warning came on. Went away. Next day I am driving, same light..then the transmission warning, then the washer fluid, then pretty much all the lights. Car eventually started bucking losing power. Barely made it an area with a shoulder. After it was towed to the dealer and looked at, it turns out there was a leak in the rear fender lining and water had been shooting in to where the battery is, eventually causing a short. It had been raining the few days preceding this incident.
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