I disassembled the atomizer and checked it carefully. sounds like the gold coating on the inner parts is disappearing (wearing out) sporadically and this is causing inconsistent ohm reading which is very important for TC mode.
during atomizer analysis, I got multiple different ohms such as 0.381, 0.39, 0.41, and up and down again without even touching the coil or Atty!!
fortunately, the inner parts are fully detachable, thus, Re-plating should be a good solution.