Is there a board or any other electronics on board that may have broken? I forget if its regulated or not.
Quick check to see if the tailcap is the culprit, just short out between the back of the battery and the back edge of the body with a piece of metal, such as a paperclip or knife blade.
Question: the tail cap works by making contact with the neg end and the machined end of the flashlight body at the same time?
The light is regulated.
Try whacking it really hard against something wooden. That has worked before for me.
Well its working sporadiclly now.
Will they send me a new TC even if is been over 6 months year since I bought it?
Most likely. They will need to know the generation and color to match it. Their "silver" color is different between the different generations.