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The blinkies are unrelated to your lens communication error.
Try gently wiping the contacts in the lens opening in the camera with a clean cloth and gently dpress them to make sure thay are all free to move.
Yes, at first it was only the one but then my wide angle and now my 70-200mm is doing it also. That is why I think is it the camera itself. But will try cleaning all contacts.
I read somewhere to use an eraser on them, have you heard this? Of course making sure the camera body is in a position so as NOT to let debris fall inside.