Flashlight stop to work after fall to the floor

[tatasal]

My Nitecore EA11 stopped too after a drop, check this out:

Nitecore EA11 dead after a drop (now alive again)

One of the lights I edc is my NC EA11. A couple of days ago I dropped it to a concrete floor. While it still worked immediately after I tested it, a few hours later nothing can make it work. I know it’s not the tailcap nor cell as I have another NIB EA11 and tested the old tailcap. What could perhaps be the problem?