Blade CPs are plagued with glitches. I sold mine long ago.

With that said, keep the heli out of the plane of the antenna. What I mean is, point your tx so the antenna is pointing upwards, not horizontal.

You can test this at home kids! Point the antenna straight out away from you(horizintal to the ground) and then hover the CP up through the antenna plane. It'll glitch as you pass thru it.