Golf driver heads breaking off?

You're applying too much force to the ball (don't we all wish we had that problem? :P). This is the one instance where I'd suggest a .350 tip over the normal .335. There's no real playability difference between the sizes, but the extra material may decrease your likelihood of shaft failure.

Another option: Bubba Watson has one of the highest swing speeds on Tour; he uses the TT Bi-Matrix shaft, the one that's graphite for the first two-thirds, but steel for the last third (the tip end). The steel tip may also help you, maybe moreso than the .350 graphite option... but the shaft has to fit your swing speed/style.

Do you put any kind of insert in the tip end? Swing weight tips, "accuracy inserts", etc.? It's been said that any kind of insert that's located where the hosel meets the shaft can cause shaft failure.

Who's building your clubs? Do you trust them? The only other thing I can think of is they're breaking because of improper installation. To properly secure the shaft to the head, the layer of clearcoat and paint needs to be removed. Too much sanding can weaken the graphite fibers, which will obviously cause them to fail. I don't want to insinuate anything, but it at least bears checking out, at least for peace of mind.

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Driver Heads

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You don't hit your driver on the center of the face most of the time. This cause the driver twist a little during the impact.

I suggest find a Driver shaft that has a very low torque.

your heeling too many shots, masking tape lightly applied to the face will show your impact

if you practice just 1000 balls a week, 1 in 10 is 100 major shocks to the shaft at your swingspeed

a bondo mix with less hardner will have more give but will not hold up to toe hits

I have to agree with Brenda. My first thought is that you're hitting too many shots on the heel part of the clubface. That's pretty much the only way you're going to shatter shafts.

are you hitting the ball cleanly or stubbing the ground.