Consistent robot flicker every 64 seconds

[William Kunkel]

We noticed a really odd problem with the robot when we started doing full testing. Every 64 seconds, the robot "flickers" for a fraction of a second. Relays (and possibly PWMs) shift into neutral, as well as solenoid valves. There is an audible clicking from the solenoid valves and almost every light on the robot goes out. However, we don't lose communications, and everything is back to normal a split second later. Still, the behavior is very disconcerting, and we can't see any obvious explanation for it. Before I get into trying to flowchart the code to see if anything is illuminated, is anyone aware of any sort of loops in WPILib that run on a 64-second timer?