Dear user,
I have done some research on this issue and found on the following forum that it could be caused by screensaver :
https://askubuntu.com/questions/1272276/x2go-session-unresponsive-after-brief-period
Then I removed the package “xfce4-screensaver” on login nodes, if your session is freezed ,please kill the session and restart a new one. Of course don’t hesitate to give us feedback.
Best regards,