If you run into this
I thought 2016 was regening while working and was getting annoyed but realized it actually resizing the window.
Had to many things open at the bottom and if coordinates were to long would not have enough room and it would resize window, then when coordinates would fit beside paperspace tab at bottom would resize back and was happening every 5 or so seconds.
I just removed some of the settings to show by clicking far right button and unchecking it.
Pic shows where not enough room and moved below model and paperspace tabs