Why is my camera not focusing?

Episode 1645 (1:40:38)

John from Mount Juliet, Tennessee
Sony A7R IV

John has a Sony A7R and he's having some focusing issues with his lens. Leo says that you can sometimes accidentally switch off autofocus on the lens. So make sure your switch is enabled to AF. Another thing to do is update the lens' firmware. Yes, your lens has firmware. It may be old or even corrupted. So update it. Also, clean the contacts with a QTip and some alcohol.