Hi all, new to this forum because I have an altitude issue with my X-T1. Starting at about 1.500 meters above sea level, the Q-button and OK-button become unreliable. At higher altitudes the buttons do not respond at all. The phenomena vanishes again at lower altitudes. Camera has seen a repair into the matter but the problem persists. Does anybody know of similar experiences? Thanks in advance for any input, Dirk.