During my recent visit to the Balloon Fiesta in Albuquerque, my Sony NEX6LB with a Sony SEL18200 lens started to vibrate when it was turned on. I could not tell where the vibrations came from but they were strongly felt in my hand around the lens. The vibrations continued for up to a minute (estimated). I tried to take a picture while it was vibrating to see if that would stop them - but it did not. The fuzzy picture showed an up-and-down movement. I have attached a couple of pictures and one without the problem.
This was the first time I have had this particular problem but it occurred several times that day and lasted for various lengths of time.
Does anybody have any ideas what caused these vibrations? They are not reproduceable on demand - they occur randomly.