I go out with mine 5-7 times a week depending on weather conditions,each outing can be 100-200 shots,it can freeze once or twice during each outing or not at all so i am hesitant to join the poll as i will be using mine more than most and so would expect it to happen more often.
When the dealer rang me yesterday i was having a nap
so didnt grasp everything he said,it did sound like they had done the same things as last time and reported no fault found,there was though a statement at the end about something they had done,thats the bit that didnt sink in to my half asleep brain but will post the details when i have collected the lens.
I may be more demanding on this than some as this is a dream focal length for me and to have it in a zoom with OS is incredible,even with my moaning about it there is every possibility if its not cured i will keep it,need to just think a bit more about that,i know its not a camera fault as i have used the 50-500 sigma for three weeks with no freeze up.
What keeps coming back in my mind though is the fact the Canon users had this problem in the early days i heard of two cures for it,one was a firmware update on the lens the other was a setting in the canon camera that told it not to try if it couldn't get focus quickly but not been able to confirm either.
The only setting in the Nikon i can find is how much time the camera waits between refocusing,there is a default setting which you can extend the time or shorten,there is also a off setting that as i understand it removes all the wait time and makes it full time AF,if i still have problems i will play with that.
Mine is the D7100