I purchased my Q5 less than a year ago, it runs off of a Turbo Battery, and to it I have a Twinlink reciever connected and to that the Receiver is connected to my D700. I was told to run the Q5 on the TTL mode with my Camera. Here's the problem: I can go to take a photograph and the thing won't fire. It will fire just fine for several shots then suddenly it will not fire. It seems to me that the amount of light in the images is quite inconsistent. I try to play around with it during down times during a wedding reception, but I'm growing very frustrated with the thing. I do believe that it would be a powerful tool but I've read through my manuals, synced everything accordingly and still come up with the results of it not firing for several shots and then all of a sudden it does. Does anyone else ever encounter this problem? If so, have you resolved it? I'm curious to know if it might be something as simple as replacing my twinlink for something more powerful. Any help would be greatly appreciated.