Nevermind, that may not be the only cause. I had two shoots today, one indoors and one outdoors. On the first shoot the camera didn't freeze at all so I thought all was well. I was making sure I gave the camera plenty of time to "wake up". On the second shoot the camera started freezing within the first 15 or 20 photos and kept happening until I switched shooting modes. Again, I was giving the camera plenty of time to wake up. I switched to either single shot, or continuous high and the problem went away on both of those modes. It only seems to happen on continuous low, which is where I like to shoot the most for subjects that move or blink. I end up with way too many photos for my needs on continuous high.
I love my XT2 but this problem is starting to get really irritating as it becomes more frequent. When I pull the battery, the frozen photo in the EVF is lost. I'm hoping this is one of the bugs that will be fixed in the new firmware update!