Thanks, it is none of those things, I wish it were that simple. The random loss of sync is unpredictable, random. It works perfect for a few shots, maybe twenty shots and then one or two do not sync, in the water or on my kitchen table. This in any camera mode, strobe mode, trigger mode with various strobes (S&S, D2000, S2000, S220, YS) and all sorts of cables (Inon, Divervision, Nauticam), with the trigger set to sTTL or M or anything in between. It syncs fine and then it does not. I thought at first when the camera wakes up after going to sleep but even with my booster battery and the camera never goes to sleep, same thing. Tried a different camera and three different UWT triggers. When it works it is great, but it is not reliable.
I still like my camera and enjoy using it but next time it will not be a Sony though the above problem is not due to Sony (I think). Here are the irritating things about the Alpha cameras:
1. No native fisheye lens, zoom or prime.
2. No pre-flash cancel.
3. The 1/160 maximum sync.