I did some testing over the weekend, here's what i've found. The brilliant new automatic feature Umberto put in may have some sequencing issues. I have used it for a while but have had the 3 issues of (rear baggage cart doesnt move, infinite boarding, fuel truck can sometimes get stuck), needing a reset. This would happen in 50% of flights, unless, I reset before starting de-boarding.
On Friday I unchecked the automatic services option and opted for entering the pax numbers manually. I now call deboarding, stick in next route, call fuel, drinks trolly and when deboarding is finished, the new boarding.
Since making this change I did not see any problems with any of the 6 flights over the weekend. As I am 3 days free of issues I will tick that option back on and see what happens today.
Umberto, i'm wondering if this is a sequencing issue that the first baggage cart moves (in automatic mode) and then catering and fuel are automatically called stopping the second one from moving. If you need any logging im happy to provide.