Simulation Getting Stuck

I am having trouble getting my simulation to run for long periods. It is a relatively simple simulation to test traffic of forklifts throughout a factory. It consists of many pathways and resource controllers. I am having an issue where the simulation will pause or get stuck but will not start again if pause and then play is hit. It will get stuck at the same time unless I move the starting position of a forklift or two, then the time changes. It most often gets stuck around the 10 min mark but will not go over 3 hours. I don’t think it is a halt command because when it stops it still shows the pause button and for the previous reason of it not starting again.

Has anyone delt with this before? Thanks