Hello, I have the following problem: If I want to warm up the engine and start again a few minutes later, it sometimes does not start. The starter spins, but does not start with anything. After 1-2 attempts and about 2-3 minutes wait, it starts again without any problems. Was already in the workshop, but they could not find anything. Who has a tip? It happens several times a day, sometimes it runs for 2-3 weeks completely without problems. ?????? Thank you! Harry