There might as well be more than one problem. People have rubbed the cover against the fleece sweater and got trouble, for others freezes happen when they remove the device from a pocket/bag etc.
We also know that the problem is either less pronounced or most likely non existent for the people with the lighted case, that is almost identical in design. That leads me to conclude that it is not the depressing of the buttons, as the device should not even be reading them in sleep mode.
Some say we will get some sort of a solution on the 17th, so we need to give it two more days
.