Ikelite DS125 not firing at depth

Hi has anyone come across this issue I have two DS125 that work perfectly at the surface or in shallow water down to about 5 meters then one stops firing. If I turn it off and on it will fire once then stop.

I have swapped the batteries over and it has done it with the other strobe.

Any suggestions or is it a case of getting a new battery. I just don't want to get new batteries to find it was the strobes!

Curious one that! Seems really odd to me that a battery would be affected by depth.

Are you running both strobes off one cable? Or are they on separate cables? And it was definitely swapping the battery that made the difference?

(Sorry, no experience though of DS125s!)

Hi yes running two separate cables both fiberoptic triggered from the camera's flash and have swapped the batteries around.