Do you have anything between your frame and esc? Carbon conducts so if the prop hit and moved the esc and any positive trace made contact its real easy to let the smoke out.
Or maybe you skipped flashing and recalibration after the repair?
I heat shrink all my escs out on the arm for added protection. Never had heat issues even on the hottest of days. Then I double side tape them to the arm for added isolation.
I did see the new v2 escs are having issues on some setups with letting the smoke out.