Thank you very much for the response.
Indeed, during the trip to the practice area, I did a lot of kicking the time compression several times. So now I assumed that could be the cause of the problem...
But...yes But! It didn't help! I have of course made the journey again, gosh, how long does it take... It took me 1 1/2 real days to get to my practice area. (DarkWaters, submarine school, convoy attack) I was in plenty of time to see the convoy coming....
But I've never seen it!
The sonar also gave no sound, not even an alarm from the crew. But all updates on the map. That's why I could predict where I should be lurking...
Do you have any idea what could be wrong?