A few times now, I have saved a game [when it was working perfectly] and closed the game down.

Come back several hours later or the next day, problems occur on one or two sensors [always in the same place] which then cause delays when I am not paying attention [just running the game to get some cash/green/red points].

The game was ok BEFORE the save, but something must happen with the save!

Edit: Just now, a train completes it's journey to Osaka from Senrioka, arrives back at Senrioka and turns white. When the timer goes down it has changed the route to:
Senrioka 2 <> Senrioka 1 [when it is already at Senrioka 1.
I had to let it go, then reverse it when it stopped at the next arrival sensor signal before it went back to platform 1 and left the map?
I let it run until it came up again an hour later and the same thing happened.

When I first set up the route, it ran as it should.
Something is happening when saving and leaving the game.
I don't know if the latest update has something to do with it [as it has only happened since then].

It's getting to a point where I am having to check ALL the sensors on the map and schedules!
Now I know why I stopped playing this game for a year!