One of the things I use skydemon for is to log my flights during  Paradrop operations, so that I can check how efficient I was flying that day. Up until March 2024 , it would do this continuously from the moment I clicked on the log engine start, up until the moment I clicked on engine shutdown. The time in between could be anything between 20 minutes and 2hours. But since the middle of April, for some reason Skydemon just stops logging after about 33-39 minutes which is usually in flight.

No, you don't need to log engine start if you don't want to. So, you logged Off Blocks, then what happened? Could you describe the rest of your flight and what your log looks like, compared to what you expected it to look like? You could send your log to us (at customer support) for us to inspect if you think something has gone awry.