Digitrax using PSX circuit breakers (CB).

During operating sessions, while several trains were running, sometimes all the CB's would start flashing on and off shutting down the entire layout until the short was corrected.

It took me awhile but I was, finally, able to recreate the problem.  I put an engine on each power block district that each CB was controlling and then put a quarter in each block until the problem occurred.  

I emailed Larry Meier at DCC specialties and he gave me a few things to try.