Flyboy62 posted:Yes the activity light on all of the modules flash like crazy. In computer lingo we call that jabbering when a Ethernet port goes crazy like that. When I removed the SER2 all goes back to normal. And the scenario is repeatable which is why I believe the SER2 need a visit to Lionel.
I've not seen a case where an SER2 was causing trouble, but your observations seem sound. I would contact lionel customer service after the new year and ask them about swapping your SER2 out.