E320 95 Intermittent Start Problem

[duc4208]

I've recently experienced intermittent start problem on my 95 E320. In the last few days, the car sometimes does not start. Hot or cold start it does not matter. When it start, it run fine. My wife is scare now because after park a car few minutes, she could not start the car. After trying several start for about 10-15 minute, then it start again. I expect some thing wrong with relays. Last time, I experienced the intermittent problem with the turn signal. It turned out that the combination relays was faulty (has black burn mark in the I&C board inside the relay). I changed the combination relays and it work fine since then. Where should I begin? Any suggestion is greatly appreciated.