Nikon D100 lens interface problem

I have a Tokina 80~200 F2.8 ATX lens that dosn't interface with the D100 properly. installing the lens is normal and function is normal for the first shot then I get a FEE error and have to remount the lens to clear the problem. Just turning the camera off and back on gets the FEE again.
I sent the lens back to Tokina for service and it worked fine for about 6 months. I have other Tokina and Nikor lens that work fine on my old 8008S and the D100. with a $100+ repair bill I tought I would ask you all Thanks