I've owned a K2, a KDXG, two K3s, a K4S, three PW1s, and a PW2. None of them ever broke down. Granted the three PW1s had rubbish screens and all three were returned. The PW2 had a better screen, but it was still not very good so I gifted it to a friend. But my Ks never suffered any actual breakdowns.