2.5 DTI starts badly

Hi people My Ommi doesn’t start scgon in cold condition immediately, but only after a few turns. If I go to work for example – 19 km . When I start again after I make out the engine, it starts immediately, but a few minutes later it doesn’t want any more. Sometimes it comes after several attempts and long orgling and at the same time full gas. Sometimes I have to wait up to half an hour and then it starts as if nothing was new. Air filter is new. selfilter also. I can’t think of anything else that I should do…. It’s annoying. When I’m on vacation, I don’t even turn off the engine while refueling!!! It’s also automatic, so push it out. I pulled the plug off the LMM last time, it jumped on! Can he have anything to do with it? I’ve got a new one here, it was built in, but it also jumped on net. For your tips many thanks in advance Greeting Robert CAR 2,5 DTI – 4/03 – 232,000 km – everything except Le u level