I have been using the Nauticam flash trigger via fiber optic connection to 2X Inon Z240s with mixed performance. Sometimes it fires great... with no issues. other times the strobes won't fire at all, or one fires. Today I noticed that the strobes would not fire until I pointed the camera upwards, at the sun. (?) This was the second dive and I had taken about 100 shots on the first dive... so batteries in the strobes should have still been good. I switched to fiber optic TTL just to check performance and it was working fine. I do usually have issues of inconsistent firing on every dive regardless of battery levels, so Im not sure battery life is the culprit. I checked to see if anything was blocking the light ports in the housing or on the strobes and nothing. I am using the Nauticam 7d mk 2 housing that is equipped with the prism mirror for the fiber optic ports... Any ideas?