Please do post your findings. I am in the exact situation as you. Two weeks ago I purchased from B&H and received the camera last week. After 150 or so clicks, I hot spotting exactly like you and others have posted. After research, and taking into account B&H had an extended shutdown for the holidays, I decided to clean the camera and give it some more time, as I still have 2 weeks before my 30 days are up. I first tried air with no success, then a static brush with no success, so I wet cleaned the sensor. After 4 pads using Eclipse the sensor was clean. I've taken 30 or 40 more pictures with no spotting, but I do expect it to return based on what others have experienced. I believe the problem will eventually subside if it returns, so probably will not go through the process of exchanging by mail with no guarantee with a different unit, but it is good to hear of your experience at B&H. I will be interested in knowing how your replacement performs.