In anticipation of an answer to Bob's question, one thing you can try is a system reset to factory default as a common cause of issues is something that has inadvertently been changed in the setup.
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
