I would first get the RCM repaired or replaced. If the problem persists I would then contact one of these individuals who will sort out the problem and get it repaired:
Miami Matt's mercedes & Crossfires All of the U S A ,,,will travel .786 877 5959 text will call u back
Ft Myers DualSportDad Alex@TightWorkAutoRepair.com , 239-603-9533
Good Luck!