The unit is meant to be held with the single button on top. It’s the only one used on-the-air. The other two are only used during setup.
I’ve hit the two setup buttons by mistake recently. It throws everything out of whack!
I can see why now, but it wasn’t that obvious. In order to press the top button, my finger must cross the buttons on the bottom. If they were recessed this wouldn’t be a problem.
As of tomorrow the single button will be on the bottom. Problem solved, I hope.