OMG this never happen to me before! What happen?

Few months ago I've sent the 2650KV motor for non warranty repair.
The motor blew up by a faulty MMM ESC.

Today I had the opportunity to install the new 2650KV motor instead of bashing with Tekin motor.
10 minutes later.....still bashing......my buggy flew into the sky
Make a hard landing and make some flips flaps.

My buggy is dead: bended shoscks, broken suspension arms.
Also my Hyperion 4S 45C 4200mAh didn't survive (a dent in one of the cell).

What was causing this big crash?
Hmmmmm....after checking...the new 2650KV was the bad guy.
The motor axle wouldn't move it's really stuck!
That's reason why the buggy suddenly flew into the sky

Can anyone explain why the motor suddenly blocked?

I will send it back for warranty repair