I had the same, twice, but half way, and only up front, both time it was raining hard...they said they repalce the unit in the driver door that had a bad contact, I noticed it also when I washed the car, the doors would lock-unlick only with the water pressure from he hose
I seems to have corrected the problems

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j-p - montréal
2007 X5 4,8, saphire black, saddle brown, sport package SOLD
2011 X5 Diesel