r8169, broken supported ports FIBRE

On this card using the r8169:

Device: 02:00.0
Class:  0200
Vendor: 10ec
Device: 8168
SVendor:        1458
SDevice:        e000
Rev:    02

I've a strange problem. No kernel messages but the card is functioning only for a few second every 20 seconds. Ethtool reported the card as connected using the FIBRE port at 1000 speed as available only.

Settings for eth0:
Supported ports: [ FIBRE ]
Supported link modes: 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: Not reported
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: FIBRE
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
Link detected: yes

I tried both ethtool v5 and v6 to change card port from fibre to tp or mii and from 1000 to 100 or 10 but everytime it says card is not supported.

I've also tried all the fancy kernel parameters about msi, acpi, apic, apm, etc.

Should i try the r8168.ko from the realtek web site instead of the kernel module r8169 ?