Anyone have this happen to them? One of my Yongnuo 560 III's started to only fire at full power. Everything was working normal, until my last shoot. I was setting up a shot and needed to lower the power on one side, and I lowered it to 1/128 and saw that there was no difference between that and 1/1. I use a TX560 controller, if that means anything. I tried switching it to different modes (slave, manual, remote), and no luck. Replaced the batteries and no dice. Kind of strange for it to randomly start doing this, but I guess for a $60 flash I shouldn't expect any better? Any ideas?