I had a U-Can-Do 60 do the same. Coming out of a failed blender attempt. Wasn't pulling up hard or going to fast (I thought anyway) when the stab just came off. I was not so lucky. The plane basically disintegrated when it hit a tree.
I did do a little investigation on it and GP had posted a warning about a !QUOT!catastrophic failure!QUOT! from overpowering/over-speeding the plane. They did not say what the problem was, but I think we all have seen the results. I also checked out a new U-can-do 60 kit and I noticed some of what used to be balsa at the tail is now plywood.

Ed