Rocco-c280

I've been having starting issues with my c280..the only time it occurs is when I drive the vehicle until it gets normal operating temperature then I will park go somewhere for 30 mins to 1hr. When the engine is still warm i try to start it and it cranks but then stalls out. I'll try it a couple times then eventually will start. The car performance is fine while driving besides when I let it completely let it cool down then it starts right up but rough idle in drive but eventually calms down when temperature goes up. What could this be from??? Please help?? Crankshaft position sensor??