deadbolt Offline Upload & Sell: Off
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I've experienced that same issue; intermittent black frames and loss of AF. It happened once while shooting a Downhill Mountain bike race where it was VERY dusty. Each time I was having trouble with focus (not focusing at all), I'd loosen the lens and rotate it back and forth on the body then lock it back in place which would get it working again.
I didn't notice the black frames until the end of the day when I was reviewing images. Out of several hundred, I had roughly 5 that were black. After that event I gave everything a good cleaning and haven't had that issue since.
Is it happening with all the lenses you mentioned, or just one in particular? When you said you cleaned the contacts, did you get the ones in the body as well?
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