In the last couple of days, I noticed that buffer size on my D7200 has dropped to 6 frames, down from the usual 15 frames for 14-bit compressed RAW. (Here I am referring to the r, remaining frame count that appears inside the viewfinder, when you half press the shutter release button.) I thought somehow my D7200 has become a D7100. I fired a few test shots and sure enough, the buffer filled up very quickly. I played around with the settings a bit. It turns out that the culprit is that I had auto-ISO on. Even so, on the D7200, as long as the maximum for auto ISO is 10000 or lower, the r frame count (buffer) is still 15 frames. However, if the maximum auto ISO is 12800 or higher, r drops to 6 frames. I then checked the D750. As long as your maximum auto ISO stays within the rated range, the buffer is not affected. When the maximum is set to the Hi range, the buffer drops. The problem with the D7200 is that it is rated to ISO 25600, but the auto-ISO buffer drops once it reaches ISO 12800.