Hey Tina, thanks for your feedback! I have to admit that i never played a multiplayer game in Factorio - and I don't immediately see how my mod could crash a game: it basically duplicates schedules, nothing too fancy. :-)
I will however make a multiplayer game, and see whether I can reproduce the issue.
How often did it occur, after the first 3 hours went by without a hitch?
If the desynchs happen regularly, you can 'quickly' try and see whether uninstalling the mod 'fixes' it. The mod does not affect save-games or other ingame state, so should be removed and re-added without any problem.