That dmesg is about a year old, I'm leaning towards ESD damage.
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue R0me0 ***
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue Nick Holland
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue Zeb Packard
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue R0me0 ***
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue R0me0 ***
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue Peter Hessler
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue R0me0 ***
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue Nick Holland
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue R0me0 ***
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue Miod Vallat
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue Zeb Packard
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue R0me0 ***
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue R0me0 ***
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue Nick Holland
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue Zeb Packard
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue R0me0 ***
- Re: RTL8169SC OpenBSD 4.8 to 4.9 issue Zeb Packard