seems like some poorly grounded connections.
I knew someone would say that.
Let's review, zero failures out of hundreds of Canopy, Ubiquiti and Tranzeo radios and all but one 711 and one 711A have failed, on the same night, due to an electrical storm. Every 711 or SXT is coupled to a Ubiquiti AP on the same mast or to a Canopy AP on the same mast or a Tranzeo backhaul on the same mast. Nothing else failed, just the 711's and the SXT's. So, it may be that the problem with the Ethernet port on 711'a and SXT's is exacerbated by any number of things including a problem with ground, but there is still a problem with the RB711 and SXT.
With Routerboards representing less than 2% of our outdoor radio gear, no other equipment failed. Just the RB711's and SXT's. One 711 that failed was 10 feet up on an 18 foot mast grounded to a well casing that is 360 feet deep. The shielded Cat5 is grounded at the power supply, also grounded to the well casing. The ITElite enclosure is grounded to the mast. Cat 5 length is less than 8 feet. The Ubiquiti Bullet M2 AP at the top of the mast is cruising along with no issues and I've had Canopy gear running at the same location since 2006. This particular RB711 is one that I can establish a 10Mbps connection with. 100Mbps will negotiate but packet loss is too great to allow communication.
As others are experiencing the same problem, the manufacturer should acknowledge the problem and streamline replacement when the new hardware version is available.
Just like every one of my RB450's have failed, all due to sub-spec capacitors. This happened well outside of a fair warranty period so they are in the landfill. The 711's are no more than 90 days in the field. The SXT's, perhaps a month.