Hi, I have a giant bug of Minecraft on my Lenovo Y50-70, a gaming laptop. When I launch Minecraft (official and premium verison) on a Nvidia GTX 860M after 20/25 seconds of gameplay, Minecraft goes to 0 fps, it's stops for 2/4 seconds and after 1 second it return back to 200/300 fps. I tried to format my pc and reinstall java and .minecraft and the minecraft launcher. Is not a problem of my GPU, becouse in the other games (ex. call of duty, Heroes and Generals...) I don't have this problem. I never overclocked my gpu! but I see an error in the Minecraft log, and it says "Item entity 2505 has no item?!". I searched this bug on internet but i found only MULTIPLAYER problems with this client error, but I have this problem also with SINGLEPLAYER. I tried everything, please help me. In the txt file I've added to this mail look at the end the error. (sorry for the english) This problem is appening also in the 1.8x and from 1.5 to 1.9.4.