Engine die after start, and no compressure

Hello all..

I have a strange problem, with my Audi A4 B8 2,0 TDI, CAGB engine...

The car starts normal, no problem at all, but after 1 - 5 minuts, the engine stops, and when i try to start there is no compression and the engine just cycles....
after a couples minuts, the car starts again, and no problems..

I have seen this 2 times in 3-4 weeks..

Maby high oil pressure, thats keep the valves open?

any more ideas?

Sorry for my bad English.

Best regards.
Morten