G 300 TD jumps when it’s warm bad

Hello dear community, with my G 300 TD there are always start problems when it is warm. So that it only starts when it has reached operating temperature, if you want to start it briefly, stops and the engine starts immediately after it starts. Even if you would gurgle it for minutes, at the first start (so if it is warm), it doesn’t start. Everything goes normal. Aglow Rele display etc……… Does anyone have an explanation for this? Greeting E.E.