This sounds like the same problem we were having a while back - installation variables wouldn’t update reliably, and we would sometimes also lose the variables display – see my previous thread:
For a while, every time the operators started the program, they had to run a script which showed them a random number, then they had to stop and re-run the program to generate a new random number. If the number changed, it was ok. If the number came back the same, they had to reboot the control.
The issue seems to be solved with 5.12- haven’t had any such issue since we updated. We have 5.13 on one system, which offers some extra features that are nice to have, also.
Edit to add -
At the time, we had 7 systems running similar applications - we saw this happen periodically on at least 4 of them. A couple were doing it quite frequently for a while.