Tom,
Sounds like it is the lower right corner of the screen. If it is a Screen issue, it would behave similar on any buttons in that lower right corner. Here is a trick that you might try. Sometimes the screen can get warm and then put away with something pressing up against it.
- Try turning your iFly 720 on and leaving it face down on a flat surface overnight.
- Power it off in the morning and let it cool for about a hour.
- Unplug the iFly and then try calibrating it.
I've seen this help several times. If this does not work, then we probably need to look at replacing the Touch Layer. If you have already had the Touch Layer replaced, this might be covered by warranty. I'd recommend contacting our Support Team to be sure. Have a great evening.