2019x crashing A LOT!

Hello,

I have fanuc robots that I've uploaded programs and system files from customer backups. I can run (play) the task without any issues, but when I step through the task I start to see a lot of runtime errors....A LOT of runtime errors, that cause the software to crash and be restarted. I had 5 in 45 minutes. 

Has anyone else experienced this issue?

Thanks, Steve