Transmitter 'forgets' which receiver to send to
We shot our first (and second) wedding with our V6's. We had 3 lights set up, an Alienbee 800, Canon 580ex II and a Yongnuo 560 III. During the toasts, my wife and I always use 1 light each on either ends of the room. One speedlight was set on A and the other on B. I set my transmitter on my camera on A and she was on B. When we would take some pictures, they would go off fine. But if we lowered the camera, they would switch to the other ones channel. IE: I was on A and if I lowered my camera from my face, when I shot again, the receiver set on B would fire, even though my transmitter still said A. For us to fix the issue, we would have to press another channel and then turn it off again (turn on B and then turn it off again). Eventually we put both on the same channel and just had to deal with it that way. But another thing I noticed was that the Alienbee didn't fire every time that the speedlights did. It would fire usually every other shot or every two shots. We never had an issue with the Alienbee's not syncing every time in the past. I would like to think that we maybe just got a bad V6, but this happened two nights in a row at different weddings using different V6's (we have a total of 6) on both a Nikon camera and on a Canon.
Another thing I notice is that on the day we received them, I was playing around with the menu system and I set one of the V6's to the 580EX II profile and then later switched it back. Since then, there have been a few times where the profile was set on SEVERAL V6 models to the 580EX II profile and I have had to switch them back.