I have also  this issue with disconnection every 30 sec in my enterprise
network. All is fine with my personal internet connection:

% sudo mii-tool
eth0: negotiated 1000baseT-FD flow-control, link ok


% sudo lshw -class network
  *-network               
       description: Ethernet interface
       produit: RTL8111/8168B PCI Express Gigabit Ethernet controller
       fabriquant: Realtek Semiconductor Co., Ltd.
       identifiant matériel: 0
       information bus: pci@0000:07:00.0
       nom logique: eth0
       version: 06
       numéro de série: 10:1f:74:17:71:99
       taille: 1Gbit/s
       capacité: 1Gbit/s
       bits: 64 bits
       horloge: 33MHz
       fonctionnalités: pm msi pciexpress msix vpd bus_master cap_list ethernet 
physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8168 
driverversion=8.031.00-NAPI duplex=full ip=129.184.161.221 latency=0 link=yes 
multicast=yes port=twisted pair speed=1Gbit/s
       ressources: irq:42 portE/S:4000(taille=256) mémoire:c0404000-c0404fff 
mémoire:c0400000-c0403fff
  *-network
       description: Interface réseau sans fil
       produit: RT5390 [802.11 b/g/n 1T1R G-band PCI Express Single Chip]
       fabriquant: Ralink corp.
       identifiant matériel: 0
       information bus: pci@0000:0d:00.0
       nom logique: wlan0
       version: 00
       numéro de série: 38:59:f9:7c:da:b0
       bits: 32 bits
       horloge: 33MHz
       fonctionnalités: pm msi pciexpress bus_master cap_list ethernet physical 
wireless
       configuration: broadcast=yes driver=rt2800pci 
driverversion=3.2.0-26-generic firmware=0.34 latency=0 link=no multicast=yes 
wireless=IEEE 802.11bgn
       ressources: irq:17 mémoire:c4400000-c440ffff

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https://bugs.launchpad.net/bugs/896575

Title:
  ASUS M5A88-V EVO Ethernet instability

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