We have had some radios (532s in dce boxes with proper grounds etc.) where the eth on POE dies. The other two eth ports work fine. its happened to 4 of them now and i was wondering if anyone else has had a similar problem?. Could there be a problem with this batch of radios?
Thanks,
Neil
Over the years there have been reports that the POE port on a RB5xx is a little more sensitive to static or electrical surges than the old RB2xx series was. I remember taking a lot more calls to RMA a 5xx for blown POE ports than I did for 2xx boards.
Ground everything, use lightning/surge protectors on your ethernet cables, consider running the cables in conduit when possible.
And keep spares handy. 
These boards aren’t that expensive and I was always surprised at the number of calls I got from companies that had lost an AP to a storm and were frantically calling vendors to locate a replacement, because they hadn’t kept a couple of spare boards on the shelf.