Hi Faldo, if you used to hit that driver well and now you can't, I strongly feel that it is a technical (golf swing) problem that you have developed.
Help me out by anserwring a few questions.
What is the ball doing out there when you miss hit your driver?
Is your 3 wood low when you hit it good?
If you miss hit any club is the tendency to be a high cut?

What is the shaft make and flex in your driver and three wood?

Let me know

Marc