I have an E-PL7, with the kit lens and the Oly 40-150. Today, when I changed from one lens to the other, the screen only showed black, like the lens was not recognized. I took the lens off and on again, and it worked. Chaging back to the other lens, and the same problem, only I had to take the lens off and on several times before it worked. Any idea what the problem might be?