I have not removed it yet. But I found this error in the logs as well.My bet's still on UPS noise until OP tries to remove it and it doesn't help doing so....
Latest firmware _40383 says it resolves the AiProtection speed penalty...
Jan 29 14:17:33 kernel: Serdes 8 False Link Up with No RX_C Symbols 0x1022 at 3.c666h at speed 2500Mbps mode USXGMII_M
Jan 29 14:17:33 kernel: ^[[0;30;103mWarning: Serdes at 8 link does not go up following external copper PHY at 26.^[[0m
I suspect the 10 gig Wan Port is glitching out so I switched over to the 2.5 gig wan port. Cable is a new Cat 7.
Kind of regretting the purchase a little.