Need advise 2004 C240 4matic won’t start

What is your question?

I check all fuses, but I don’t know how to check the relays. I replace the crankshaft sensor but still won’t start. If battery is disconnected and connected again (ground cable) it starts right away. Can someone help me please THANK YOU

What makes this problem better or worse?

Battery is new and plenty of charge

How long has your 2004 Mercedes-Benz C240 had this problem?

Two weeks