I know there have been some related threads on this in the past, but the answers seem inconclusive.
I was shooting a series of portraits on Saturday using the ST-E3 RT and 3-4 600 EX-RTs. Near the end of the first session, I started having problems with the strobes not firing. I'd shoot once, strobes would fire. Shoot again, nothing. It was all of them. So, I thought maybe the ST-E3 batteries were dying. Replaced them. Didn't make any difference.
Fortunately, we were near the end of that series, so went outside to shoot the subjects in some natural light. Came back after 20-30 minutes, turned on the ST-E3 and the 600 EXs and everything back to normal. For the rest of the day, I would shoot for 1/2 hr to 45 minutes inside, then go out and shoot natural light and come back in. No problems for the rest of the day.
Is it possible for the ST-E3 to overheat?
Since none of the 600s were firing, I doubt if they were the problem. I use battery packs with the 600s as well and all batteries were at full charge at the start of the day.
I used to have this problem all the time with the optical trigger (ST-E2, on-camera flash controller and the Yongnuo ST-E2 clone) I didn't think it would be a problem with the ST-E3 since it's a radio transmitter and not optical but, maybe it does because of pre-flashes? Anybody have a similar experience or an idea?