POE switches and lightning

[Caleb Tennis <caleb.tennis () gmail com>]

We had a lightning strike nearby yesterday that looks to have come inside our facility via a feeder circuit that goes 
outdoors underground to our facility's gate.  

What's interesting is that various POE switches throughout the entire building seemed to be affected in that some of 
their ports they just shut down/off.  Rebooting these switches brought everything back to life.  It didn't impact 
anything non-POE, and even then, only impacted some devices.  But it was spread across the whole building, across 
multiple switches.

I was just curious if anyone had seen anything similar to this before?  Our incoming electrical power has surge 
suppression, and the power to the switches is all through double conversion UPS, so I'm not quite sure why any of them 
would have been impacted at all.  I'm guessing that the strike had some impact on the electrical ground, but I don't 
know what we can do to prevent future strikes from causing the same issues.  Thoughts?