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Over 4 months mine went from occasionally to every time it woke or went to sleep. You need a new valvetronic servomotor. The way to check is by unplugging the large electrical plug on top of the motor, under the engine cover. If the sound doesn't happen when you wake the car, it's your servomotor. One thing to make sure you or your shop does is oil the eccentric shaft while the valve cover is off. BMW design improperly oils the shaft and I suspect it is the reason for the servomotor failures.
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