Friday night I disabled the auto vr swap and restarted the game. I was very careful about not removing the headset. I still got the hourglass every 20 minutes or so. So last night I disabled the mirror also and played several hours without a pause. I took the headset off several times and it didn't seem to make a difference.
Another note, when I was getting the hour glass, my throttle would decrease all the way as if I pulled back on it. As soon as the pause was over it would go back to normal.
I double checked to make sure my usb power settings haven't changed and all looked normal.