Problem(s) Encountered:

During the afternoon, the camera started reading out blank frames, i.e. frames that looked like biases, while it was taking flats.  With Justin''s help I verified the shutter was operating (or at least clacking).  He cycled the ccd electronics, which didn''t cure it; we then turned it all the way off and left it

that way for a couple hours.  After powering back up before sunset, it came back up OK and was fine for the rest of the night.

Might be a good idea to power down during the day.

Solutions:

This has happened a couple times.  Not really sure what is going on with it.  Doesn’t seem temperature-related, but who knows.  All I can do is watch and see... .