I have 2 Yongnuo 600rt flshes and one wireless transmitter. They work fine for the first shot but subsequent exposures the flashes seem to fire but I get a very dark image. Any thoughts? I wait until the transmitter beeps (letting me know the two flashes have recycled) before I shoot again. I have some rechargeable batteries but put brand new Duracell Quantum batteries in all 3 devices. Any advice or help would be appreciated. Thanks

