I’m seeing this issue as well when in Remote Mode only it’s the Start-Prog. I’ll check version of Polyscope I’m running when I get back on Monday but I know it’s 5.11 and robot was built last year.
Found this post Unexpected Behavior of Start-Prog
This might be a bug UR has to address, quick solve might be to restart controller. Not a good solution but I think it frees up resources again and it worked for me. Hope I don’t run into it again.