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Its been well known that the metal valve stem nuts(E in the photo bellow!) tend to loosen with miles. Use an 1/4 ratchet, 11mm deep socket to just snug them up - they require very LOW torque something like 4Nm. Also once they are tight check your tire pressures AND RESET your TPMS. You do this with the car running(but stopped) and use the BC or iDrive menu settings to reset it. The TPMS system is a "dumb" system... everytime you "reset" the system you are giving the TPMS a new "target" pressure to look for. IF you do not do this you can get false warnings with your TPMS.
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