We had this same issue with our two housings. The first one manifested itself before our trip to Palau, the second while we were there. We did try the flip of the ring on the camera that had the issue before the trip, but that didn't help. What we ended up doing was to remove the flexible ring that grips the RX-100 front dial (This sits inside a channel in the Nauticam ring and can be removed with a fine screwdriver without removing the Nauticam ring). We then inserted a thin strip of paper into the groove and replace the flexible ring. Problem completely solved with no slippage from that time forward. When in Palau, we first tried a business card to fit in the channel, but it was too thick. On land, once we put the camera back in, you could feel that the front dial was was much more difficult to use. We removed this and replaced it with a slip of paper and things were great. A really easy fix. This gives the ring a bit more pressure on the camera without "modifying" the camera wheel.