Hi I'm Jon Petter. I've been building routes and scenarios since 2010. The last two months, I've been "haunted" by out of memory crash and other crashes without any messages. The ganme has been unstable before, yes in deed, but now I feel the whole game is unusable, because og this. Jon Petter
Search the forum, there's plenty on the subject, no definitive answer but definitely steps and procedures to try out, biggest culprit is usually (though not isolated to) Steam workshop scenarios. Like I said search this forum you'll find plenty of suggestions to try.