So I just got my speed transmitter in the mail last week and decided to use it over the weekend for a shoot I had. On 3 occasions one of my lights misfired - each time was the same light, but never had this happen before using my previous transmitters.
was using my 5D and had the transmitter in normal mode firing 2x 600RX with the receivers. Didnt even try out speed mode yet.
Need more testing to see if its the transmitter or not, like I said only noticed it 3 times out of maybe 200 shots but was annoying. will give it another go and see what I get before I decide on exchanging out. Wanted to see if anyone else had noticed this problem with theirs.