Boot/binding problem

Umm well I hate to say it buddy, but....it is probably you. You probably have too much snow accumulation stuck under your boot, or maybe you did not push the heel piece down far enough down after releasing the binding. If it isn't down all the way the boot heel doesn't have enough clearance to engage the binding (there is a lot of forward pressure on those old px binders). If it is neither of these situations then go get them checked out at the shop. The heel might have moved forward a bit accidently. Good luck

forgot to say that i skied every weekend since the begining of the season....it just got worse and worse each weekend.

is the plastic on the toe or heel that goes into the bindings getting destroyed? or maybe you're accumulating crap in/on/around your boots or bindings.

Yeah, it's probably you not pushing your heelpiece down all the way or the px series heel piece can be adjusted a quite a bit so that may have moved forward a bit. 

Well it is hard to diagnose without seeing the boot and binding and if you are certain it is not you....then I would go straight to the shop to get the setup checked out. Do not ski with the binding like that, you will get hurt, and if you can't figure it out you are probably not qualified to fix it.... so get to a shop quick so you can get back out this weekend.... 

OH...ok ++k to everybody and thanks for the advice ill take it to the shope to cheack it out....thanks for the advice.