maybe he needs to get the forward pressure adjusted...
As a shop tech, you're supposed to lean towards the safe side when adjusting bindings. So when adjusting forward pressure, we're supposed to set them on the looser side. On the sollys, forward pressure can probably be adjusted forward one more notch and still be within the recommended range. That one notch may help prevent pre-releases. But you'd better get a tech to do it, otherwise you may just get stuck in your bindings on your next fall.