Use the msconfig. and what I would do is start turning on items again one by one and rebooting. when you turn an item on and the system acts up, you will most likely find the culprit . turn that item back off and start turning on the other ones.

This is a long process, with lots of rebooting, but I suspect that the culprit is either a startup item , or a service that is causing the problem.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U