he session suspend happens because of a long standing bug in x2go. To
fix it you need to:
1. install nxdialog on the server
2. change one line in /usr/bin/x2gostartagent (or wherever it is
located on your system) like this:
-export NX_CLIENT="${X2GO_LIB_PATH}/x2gosuspend-agent"
+export NX_CLIENT="/usr/bin/nxdialog"

This does not work with

export NX_CLIENT="/usr/bin/x2goclient"

I'm using arch linux. Where can I download nxdialog?