This link covers the clock time / day, night cycle issus.
I don't understand why but I limit my frame rates to 60hz and have never had issues again. When I did have issues, it was very rare, but it did bother me. This is a short thread and a good read.The frame rate stuff starts around post 20 or close to it. hope this helps.
https://www.subsim.com/radioroom/sho...d.php?t=245471