Sam Seiber writes:

Otherwise I feel JPL will stay away from the press while they work
the problem.

They said at the 9 AM (PST) briefing that they were telling everyone
to get some sleep during the rover's normal sleep period, so I don't
expect any more news until this evening (PST).

This morning (PST) they sent up a simple command and got unconfirmed
news from the DSN that the rover replied with an indication that it
was in fault mode. A previous (but recent) pre-scheduled fault-mode
communication didn't happen and the symptoms are not ones that point
to previously-considered problems.