Isn't this what -HUP is supposed to be for in the first place? Maybe a -STOP/-HUP/-HUP situation?

HUP is short for "hangup" which was supposed to be sent when the tty controlling the session the process is in hung up.

	▲	aa-jv 2 hours ago \| parent [-]
		Right, so tty's go stale prior to the freeze and they must be renewed after the freeze .. seems to me there's a missing system heuristic here.