BMWs (and many modern cars) are very sensitive to low voltage issues. A bad/weak battery is often the culprit. And yes, even if it's only a few years old (you don't say what year the car is) the battery could be going bad.
The dealer should test it as one of their first actions, but one never knows what procedures those guys use.
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Current inventory:
F22 & G05
Cadillac CT5-V Blackwing w/3 pedals
Past: E24,E28(3),E34,E36,E37,E38(2),E39(4),E46,E89,E92 (obviously),F01,F06,F10,F30,F87,G12,G30(2),G82(2)
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