Ethernet card suddenly stop working

[Syleri]

Hello, I have two ethernet cards 1 onboard and 1 PCI Express.

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01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 02)

The first one is the OnBoard and works fine. The second one the PCI Express working but after a while is stop working. Here is the dmesg:

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[    0.000000] Initializing cgroup subsys cpuset
[59382.553485] Bluetooth: Core ver 2.19
[59382.553526] NET: Registered protocol family 31
[59382.553531] Bluetooth: HCI device and connection manager initialized
[59382.553545] Bluetooth: HCI socket layer initialized
[59382.553552] Bluetooth: L2CAP socket layer initialized
[59382.553573] Bluetooth: SCO socket layer initialized
[59382.556364] Netfilter messages via NETLINK v0.30.
[59674.649299] r8169 0000:02:00.0 eth1: rtl_chipcmd_cond == 1 (loop: 100, delay: 100).
[59674.653638] r8169 0000:02:00.0 eth1: rtl_csiar_cond == 1 (loop: 100, delay: 10).
[59674.657748] r8169 0000:02:00.0 eth1: rtl_ephyar_cond == 1 (loop: 100, delay: 10).
[59674.661847] r8169 0000:02:00.0 eth1: rtl_ephyar_cond == 1 (loop: 100, delay: 10).
[59674.662208] r8169 0000:02:00.0 eth1: link up
[60100.767199] r8169 0000:02:00.0 eth1: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[60100.780026] r8169 0000:02:00.0 eth1: rtl_chipcmd_cond == 1 (loop: 100, delay: 100).
[60100.791077] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60100.792473] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60100.793846] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60100.794987] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60100.796108] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.282858] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.283935] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.285027] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.286230] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.287433] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.288448] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.289672] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.290695] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.291780] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.292958] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.294144] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.295374] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.296486] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.297714] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.299050] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.300237] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.301585] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.302814] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.303980] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60106.305316] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60107.104088] r8169 0000:02:00.0 eth1: rtl_phy_reset_cond == 1 (loop: 100, delay: 1).
[60107.105247] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60107.106758] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60107.107895] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60107.109134] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60107.110243] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60107.111387] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60107.112725] r8169 0000:02:00.0 eth1: rtl_phyar_cond == 1 (loop: 20, delay: 25).
[60107.117025] r8169 0000:02:00.0 eth1: rtl_csiar_cond == 1 (loop: 100, delay: 10).
[60107.121007] r8169 0000:02:00.0 eth1: rtl_ephyar_cond == 1 (loop: 100, delay: 10).
[60107.125291] r8169 0000:02:00.0 eth1: rtl_ephyar_cond == 1 (loop: 100, delay: 10).
[60107.149836] r8169 0000:02:00.0 eth1: link up
[60131.567886] r8169 0000:02:00.0 eth1: rtl_chipcmd_cond == 1 (loop: 100, delay: 100).
[60131.572764] r8169 0000:02:00.0 eth1: rtl_csiar_cond == 1 (loop: 100, delay: 10).
[60131.577270] r8169 0000:02:00.0 eth1: rtl_ephyar_cond == 1 (loop: 100, delay: 10).
[60131.581422] r8169 0000:02:00.0 eth1: rtl_ephyar_cond == 1 (loop: 100, delay: 10).
[60131.605744] r8169 0000:02:00.0 eth1: link up

My Debian is 8.7.1 x64. My kernel version is 3.16.0-4-amd64. I have install the non-free driver.

Thanks

[millpond]

We are not ignoring you. Just confused by your output.
First check into your /etc/network/interfaces and look for conflicts.
Then check your route output.

My guess is that at some point there is a collision of IP addresses. Possibly both being the same ethx name.