My KT65 developed random selector issues within first year (after I had done a very long PIR in a metal casting plant, basically the meter was getting covered in black dust. Kewtech repaired it FOC and it has never done the same thing again after 4 years so all good. It was a simple quick fix so maybe get it done at next calInteresting, I have noticed my kt64 sometimes flickering between continuity and IR settings of the knob is not turned past that setting and then returned to it