First check your throw when you max turn right or left with your radio. Make sure you are not applying pressure to the steering block when they are at their stops. For an aftermarket radio you can reduce the throw using a EPA adjustment. For an AM kit radio you would use a shorter servo horn.
Next check the screw and bushing that attaches it to the hub. Make sure it is screwed all the way in, not hitting the hub, not hitting the the universal and is lock tighted in place. It should move freely when the radio is off.
Limit the suspension travel so the steering knuckle is not being strained on full extension either way.
Don't hit stuff.
Hope this gets you in the right direction.