The session should not die if no license is available, it just won't be resumed.
Depending on the version of the product you are running, not all of these switching may be available. However, the switches that affect suspended sessions are:
[li] -no_suspend -- causes "interrupted" sessions to NOT be automatically suspended
[li] -max_suspended_age <minutes> -- causes suspended sessions to only persist for <minutes> minutes
[li] -no_explicit_suspend -- disables the user's ability to manually suspend sessions
If your sessions are dying when you try to resume them, an important piece of information that we'd like to see is the session log (in ${HOME}/.graphon/session-logs).
Troy