Can't say I've had, or noticed, the problems you're having, save one.
That is that as you tighten the fence down it does move. I usually
get close, tighten down, back off the knob just a little so the
fence can just barely slide, then use the microadjust to tweak into
position. Works well for me.
As far as the sticking, may be you're either a little too tight or a
little to loose (where the "grip" can twist in the slot and jam).
It's probably like Goldilocks, you've got to have it "just right" ;-)
I guess I've just gotten used to it so haven't noticed my workarounds.