3gx sudden +pitching

[garymac]

hi all i have been an active rc heli pilot for 8 years and have owned must helis on the market over the years . I decided to get a 450 dominator it comes with 3gx. As i am not fond of align gyros i removed the 3gx and put it on my old 450 pro and my vbar on the dominator. Now the main problem with the 3gx was bouncing when stopping from left or right paro. I changing setup to try fix the problem but only changing setup on the tail setting . when on the last flight just as i landed i landed on the front of the left skid at that moment the heli suddenly launched itselve up in air about a meter in the air and then slammed into the ground braking the skids and tail drive gears with out me giving any input from the throttle i did do the throttle setup in the 3gx controller. Has this happened to any one please some advice would be appreciated

heli is 450 pro
servos 430 align
tail servo ds520
esc align bl45x
using spectrum 2 satellites on 3gx
radio jr dsx9
3gx has v5 software

[garymac]

looks like no one has any idea to my problem with the 3gx looks like the only fix to my problem is a 10 pound hammer and stick to vbar