Pics and build info would be helpful. My bet is poor wicking due to either too little or too much wick. My thought is when you dripped, you directly saturated the coil. 3 pulls @ 15w would be about enough to "dry out" the saturated coil, and if the wick doesnt have good contact (too small), or is choking (too big), it wont replenish the coil sufficiently.
Did the flavor come back after dripping again?