I was using Cyber Commander at a client location when my Einstein flashes started to fire intermittently. I thought it must be the batteries getting low, so I changed them, but no change. I then pulled out my backup Cyber Commander but that didn't help. I then thought it was the hot shoe on my Nikon D4, so I swapped it out for my Nikon D3s. Still no change.
So I switched to my backup Pocket Wizards and they worked fine.
While on the shoot it occurred to me that a similar thing happened about a year ago. Both times I was at a client who was a high tech software consulting and programming shop. My guess is that these clients have some very powerful wireless networks. I have used the Cyber Commanders at dozens of low tech clients with no problem.
My assumption is that the heavy radio traffic at these locations was interfering with my Cyber Commander's radio frequency and that caused them to fail. I didn't try to change the frequency of the Cyber Commander. So I don't know if that would help. Fortunately I had a backup system, I also have a sync cord in case all heck brakes loose and neither wireless system works.