troubles with one specific if_re

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I have an express-card interface which randomly decides to stop talking:

Nov 21 09:22:29 toshi kernel: re0: <RealTek 8168/8111 B/C/CP/D/DP/E/F
PCIe Gigabit Ethernet> port 0x2000-0x20ff mem
0xf0700000-0xf0700fff,0xf0200000-0xf0203fff irq 1
7 at device 0.0 on pci3

Nov 21 09:22:29 toshi kernel: re0: Using 1 MSI-X message
Nov 21 09:22:29 toshi kernel: re0: ASPM disabled
Nov 21 09:22:29 toshi kernel: re0: Chip rev. 0x28000000
Nov 21 09:22:29 toshi kernel: re0: MAC rev. 0x00000000
Nov 21 09:22:29 toshi kernel: miibus0: <MII bus> on re0
Nov 21 09:22:29 toshi kernel: rgephy0: <RTL8169S/8110S/8211 1000BASE-T
media interface> PHY 1 on miibus0

Nov 21 09:22:29 toshi kernel: rgephy0:  none, 10baseT, 10baseT-FDX,
10baseT-FDX-flow, 100baseTX, 100baseTX-FDX, 100baseTX-FDX-flow,
1000baseT, 1000baseT-master, 1000baseT-FDX, 1000baseT-FDX-master,
1000baseT-FDX-flow, 1000baseT-FDX-flow-master, auto, auto-flow

Nov 21 09:22:29 toshi kernel: re0: Ethernet address: 00:0a:cd:1d:30:a2

After an indeterminate period, it logs ..

Nov 21 09:23:33 toshi kernel: re0: PHY read failed
Nov 21 09:23:39 toshi last message repeated 24 times

Any thoughts as to how to troubleshoot/fix?

	imb
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