I am experiencing a frustrating problem with my Nauticam NA-EM1 MII housing back buttons, this include the Play, Menu, and the arrow buttons. The issue manifest itself only below 26-27m depth, where they basically become irresponsive to my commands, forcing me to shoot blind without feedback at depth. The whole system and all buttons work well at surface when testing and throughout the dives above these I am wondering if anyone else has seen this issue? is it perhaps related to the vacuum system? anyone fixed it?