Surveying the mess, I decided to start where there was least confusion. Even this was not without a small problem. One down and 99 to go. Most observations continued processing.
First guess is a DB access problem.
Some WF2 CP2UEV went absent when the above Trouble occurred and were restarted. After about a half hour, this frozen P state thawed. Unable to open socket. Unable to open socket. Not all SCIF2 processes that access the DB fail.