Suddenly-slow Ethernet on iMac Mountain Lion

Hi,
I hope someone can help me with a problem in which my iMac's Internet speed suddenly slows down.
I have an iMac connected with Ethernet to Earthlink's DSL service, which should be at 1.5Mbps for downloading. I seem to get about 1.3Mbps, but things suddenly slow to 0.10 or below and remain at that level.
The iMac is the 3GHz, 4GB ram, bought more than two years ago and now running 10.8.5 and fully updated. The DSL modem is Netgear model DM111PSPv2 bought three years ago, but not updated.
I watch the "Network" sub-screen in System Preferences. Normally, I have a green light next to "Ethernet", which says "Connected" (via DHCP). When I have the problem, the light goes yellow, the status changes to "No IP Address" and "Status of your network connection cannot be determined". Then, it appears normal again, possibly with the same IP address but not always.
Meanwhile, these errors are put to system.log:
Oct  4 11:49:12 adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net configd[18]: network changed: v4(en0-:108.199.114.166) DNS- Proxy- SMB
Oct  4 11:49:12 David-Lewiss-iMac.local configd[18]: setting hostname to "David-Lewiss-iMac.local"
Oct  4 11:49:18 David-Lewiss-iMac.local configd[18]: network changed: v4(en0+:108.199.114.166) DNS+ Proxy+ SMB
Oct  4 11:49:18 adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net configd[18]: setting hostname to "adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net"
Oct  4 11:52:14 adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net TextEdit[278]: SCNetworkReachability server not available
Oct  4 11:52:14 --- last message repeated 1 time ---
Oct  4 11:52:14 adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net TextEdit[278]: socket(PF_ROUTE) failed: Operation not permitted
Oct  4 11:52:14 adsl-108-199-114-166 kernel[0]: Sandbox: sandboxd(307) deny mach-lookup com.apple.coresymbolicationd
Oct  4 11:52:16 adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net sandboxd[307] ([278]): TextEdit(278) deny mach-lookup com.apple.SystemConfiguration.SCNetworkReachability
Oct  4 11:52:16 adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net sandboxd[307] ([278]): TextEdit(278) deny system-socket
Oct  4 11:54:46 adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net configd[18]: network changed: v4(en0-:108.199.114.166) DNS- Proxy- SMB
Oct  4 11:54:46 David-Lewiss-iMac.local configd[18]: setting hostname to "David-Lewiss-iMac.local"
Oct  4 11:54:51 David-Lewiss-iMac.local configd[18]: network changed: v4(en0+:108.199.114.166) DNS+ Proxy+ SMB
Oct  4 11:54:51 adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net configd[18]: setting hostname to "adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net"
I have also seen this sequence:
Oct  4 11:34:47 David-Lewiss-iMac.local configd[18]: setting hostname to "David-Lewiss-iMac.local"
Oct  4 11:34:47 David-Lewiss-iMac.local configd[18]: network changed: v4(en0-:108.199.114.166) DNS- Proxy- SMB
Oct  4 11:34:50 David-Lewiss-iMac.local configd[18]: network changed: v4(en0+:108.199.114.166) DNS+ Proxy+ SMB
Oct  4 11:34:50 David-Lewiss-iMac.local mDNSResponder[41]: mDNS_RegisterInterface: Frequent transitions for interface en0 (108.199.114.166)
Oct  4 11:34:50 adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net configd[18]: setting hostname to "adsl-108-199-114-166.dsl.wlfrct.sbcglobal.net"
Oct  4 11:36:27 adsl-108-199-114-166 com.apple.launchd.peruser.501[131] (com.apple.PackageKit.InstallStatus): Throttling respawn: Will start in 9 seconds
Here are the results of the diagnostic at http://speedtest.earthlinkbusiness.com/:
Download Speed: 29 kbps (3.6 KB/sec transfer rate)
Upload Speed: 306 kbps (38.3 KB/sec transfer rate)
Latency: -1 ms
Fri Oct 4 11:51:56 2013
(Yes, my upload speed is faster.)
I have run through all of Onyx's maintenance features; I have run the Apple Hardware Test suite, without any errors showing up. I also connected the same cable and modem to a Windows laptop without problem. (I tried setting up a wireless router for comparing wireless speeds, but wasn't able to get it working.)
A simple reboot isn't enough to fix the problem, but shutting the iMac down, leaving it for a bit, power-cycling and resetting the modem, resetting the iMac's SMC, and resetting the NVRAM as it reboots, sometimes gives me reasonable Internet speed, at least until this problem happens again.
Download Speed: 1296 kbps (162 KB/sec transfer rate)
Upload Speed: 286 kbps (35.8 KB/sec transfer rate)
Latency: -1 ms
Fri Oct 4 12:26:03 2013
(Yeah!)
Thanks in advance for your help!

Sorry to follow-up my own post, but I also get the below in system.log, as the Network sub-screen in System Preferences tells me that my Ethernet cable is unplugged or that the device on the other end isn't responding:
Oct  4 14:38:28 adsl-108-195-2-241 kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link down on en0
Oct  4 14:38:29 David-Lewiss-iMac.local configd[17]: setting hostname to "David-Lewiss-iMac.local"
Oct  4 14:38:29 David-Lewiss-iMac.local configd[17]: network changed: v4(en0-:108.195.2.241) DNS- Proxy- SMB
Oct  4 14:38:31 David-Lewiss-iMac kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link up on en0, 10-Megabit, Half-duplex, No flow-control, Debug [796d,0101,0de1,0300,0021,0000]
Oct  4 14:38:31 David-Lewiss-iMac.local configd[17]: network changed: v4(en0+:108.195.2.241) DNS+ Proxy+ SMB
Oct  4 14:38:31 adsl-108-195-2-241.dsl.wlfrct.sbcglobal.net configd[17]: setting hostname to "adsl-108-195-2-241.dsl.wlfrct.sbcglobal.net"

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