just a guess, it sounds like the hammer sear has a problem, if you can hear the striker release and it resets, the trigger it's self is ok. I'd bet on the sear spring or the safety or it's spring as the problem. me thinks it be best to go back to TC good luck
I got to thinking about this while taking a shower, have you tried pulling the trigger group and cleaning the inside of the frame with a good cleaner, and if you have axcess to an air supply blow it out and do it again. get it good and dry and give it a good oiling. now don't get me wrong, I'm not saying you don't clean your weapons, I just saying that's what I'd do if it was mine. good day