Here's another possible issue.
I was having various idiot lights turn on occasionally. And at the next start, other lights would.

I bought two new keys. Those problems went away.

But I have no idea if that will fix your issue

__________________
Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport