Network connection drops out intermittently

[DavidOB]

I installed LMDE about a month and a half ago. All was well until last week, when the Internet connection began dropping out intermittently. The network outages are usually brief, and they seem to happen more often when I'm running Chromium with a Gmail window open (although that could just be my imagination). The connection seems to work fine when I boot into Ubuntu or Windows. I share the Internet connection with several others, who have also been reporting intermittent problems. However, they only seem to be having problems when my computer is turned on and booted into LMDE.

I have both a wired and a wireless connection, but the problem seems to occur regardless of which is in use. The computer is currently physically plugged into the network and the wireless is turned off (but I can turn it on, with or without unplugging the Ethernet cable, if that would help diagnose the problem).

Any ideas? I'm at a loss.

This is on a Lenovo IdeaPad Y530. Other details:

inxi -Fc 0

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System:    Host davidmint Kernel 3.0.0-1-amd64 x86_64 (64 bit) Distro Linux Mint Debian Edition
CPU:       Dual core Intel Core2 Duo T5800 (-MCP-) cache 2048 KB flags (lm nx sse sse2 sse3 ssse3) bmips 8000.12
           Clock Speeds: (1) 800.00 MHz (2) 800.00 MHz
Graphics:  Card Intel Mobile 4 Series Chipset Integrated Graphics Controller X.Org 1.10.4 Res: 1280x800@60.0hz, 1920x1080@60.0hz
           GLX Renderer Mesa DRI Mobile Intel® GM45 Express Chipset   GLX Version 2.1 Mesa 7.10.3 Direct Rendering Yes
Audio:     Card-1 Intel 82801I (ICH9 Family) HD Audio Controller driver HDA Intel BusID: 00:1b.0
           Card-2 Plantronics Inc.  driver snd-usb-audio
           Sound: Advanced Linux Sound Architecture Version 1.0.24
Network:   Card-1 Intel PRO/Wireless 5100 AGN [Shiloh] Network Connection driver iwlagn v: in-tree: BusID: 02:00.0
           Card-2 Broadcom NetLink BCM5906M Fast Ethernet PCI Express driver tg3 v: 3.119 BusID: 01:00.0
Disks:     HDD Total Size: 320.1GB (4.3% used) 1: /dev/sda Hitachi_HTS54323 320.1GB 37C
Partition: ID:/ size: 18G used: 6.3G (37%) fs: ext4 ID:/home size: 50G used: 6.7G (15%) fs: ext4
           ID:swap-1 size: 4.29GB used: 0.00GB (0%) fs: swap
Sensors:   System Temperatures: cpu: 54.0C mobo: N/A
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes 160 Uptime 1:04 Memory 2350.6/3901.8MB Runlevel 2 Client Shell inxi 1.4.23

sudo ifconfig -a

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eth1      Link encap:Ethernet  HWaddr 00:23:54:1b:fe:12 
          inet addr:192.168.0.19  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::223:54ff:fe1b:fe12/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:54056 errors:0 dropped:0 overruns:0 frame:0
          TX packets:33020 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:48617156 (46.3 MiB)  TX bytes:4417508 (4.2 MiB)
          Interrupt:16

lo        Link encap:Local Loopback 
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:550 errors:0 dropped:0 overruns:0 frame:0
          TX packets:550 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:47497 (46.3 KiB)  TX bytes:47497 (46.3 KiB)

wlan0     Link encap:Ethernet  HWaddr 00:16:ea:d8:ef:10 
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

cat /etc/network/interfaces

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# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
#NetworkManager#iface eth0 inet dhcp

sudo cat /var/log/dmesg |grep -i eth

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[    2.726060] tg3 0000:01:00.0: eth0: Tigon3 [partno(BCM95906) rev c002] (PCI Express) MAC address 00:23:54:1b:fe:12
[    2.726065] tg3 0000:01:00.0: eth0: attached PHY is 5906 (10/100Base-TX Ethernet) (WireSpeed[0], EEE[0])
[    2.726070] tg3 0000:01:00.0: eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
[    2.726073] tg3 0000:01:00.0: eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[    9.080597] udevd[408]: renamed network interface eth0 to eth1
[   18.180189] ADDRCONF(NETDEV_UP): eth1: link is not ready

lspci

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00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03)
01:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02)
02:00.0 Network controller: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection
06:03.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05)
06:03.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22)
06:03.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 12)
06:03.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 12)