Inconsistent Talon LED's

[ram112358]

Here at 3502 we're having issues with out Talon SRXs running over the CAN bus. When we have 5 Talon's wired in running from the RoboRio, through the Talons, and to the PDP with the terminating resistor pin selected (measured to 120 ohms with a multimeter), everything works as expected. If we add any of our other four Talons into the loop (before the PDP) things start to get really strange. The fist time we boot the robot, all the lights blink correctly and we can see all 6 Talons in the RoboRio web interface, on subsequent reboots of the robot however the light patterns become rather inconsistent. A few different patterns occur, seemingly at random, lights on all connected Talons are red, lights on all connected Talons blink mostly amber but every few blinks the led's would all flash red with much regularity, or they would blink red with the occasional amber light. All of these would happen to every Talon regardless of if we were shaking the robot, CAN connections, or letting everything sit still. When we us a multi meter in DC mode and connect it to either connection of the battery we get a short .4 volt spike before it drains quickly to zero it seems like our frame is not isolated from the electronics, do you think this could be causing our problem?

We've read through other posts here and all the Talon documentation with no avail, could you give us a list of troubleshooting suggestions or do you have any insight you might give us?