Sequoia Finder windows suddenly resizing when moved

After installing Sequoia, my finder windows suddenly resize themselves when moved. As soon as I attempt to drag any finder or app window to a different location on my LCD screen, the window suddenly without any prompting, enlarges to almost full screen. The new size is almost but NOT the same as "Full Screen". After re-sizing the window down to a smaller size, it stays that size.. even if I move it again. This behavior is VERY intermittent. I cannot manually replicate it. It simply happens unexpectedly a LOT. Anyone else seeing this odd behavior?