Time Capsule as router slows download speeds

Hello,
Over the past couple of months I have been having intermittent internet connection issues where my download speeds slow down from 50mbps+ (Comcast) to under 1mbps, per speedtest.net
I assumed it was a Comcast issue and contacted their support several times. They sent a technician over who had the line reset and that seemed to fix the problems, but a couple of days later it was back. Contacting support again, they had me test the speeds connected directly to the modem (Motorola Surfboard SB6141 DOCSIS 3.0). Connected directly to the modem via Ethernet, I reliably get 50mbps+ download speeds, but using my 4th Gen Time Capsule as a wifi router slows the speeds down to under 1mbps.
After doing research on these and other forums and finding people with a similar issue, I ran the gamut of potential solutions: changing DNS servers, changing wifi bands and channels (2.4 and 5ghz, all chanels tested), changing Time Capsule firmware versions (7.6.3, 7.6.1, and 7.6 are the only versions available for my 4th Gen TC).
I eventually tested with an ethernet cable plugged into the Time Capsule and have the same frustrating issue when directly connected to the router, which means the issue is with the Time Capsule functioning as a router but isn't WiFi specific.
Upload speeds are a consistent 10mbps+ wether I'm connected directly to the modem or using the Time Capsule as a router, even when download speeds are slowed to a crawl.
I purchased my Time Capsule 1 year and 2 months ago, so I no longer have AppleCare for this purchase. I am out of troubleshooting ideas and am on the cusp of purchasing a second wifi router if I can't find a way to resolve my issue.
Thanks for your help!

I can make a couple of suggestions..
You will need to install 5.6 utility on at least one computer.. if you don't have it available already.
1. Replace the ethernet patch cable from the modem to the TC.
2. What I want you to do is lock the speed of the TC WAN port to 100mbit full duplex.
This is only on the v5 utility.
Another method of doing the same thing is putting a small switch between the TC and the modem. Fast ethernet type would be best.. that will force the connection down to 100mbit.
You can also test with half duplex but that would indicate a major problem if it worked.
3. Make sure ipv6 is local link only.. there is no way to turn it off.
Having done those things.. I do note the TC lacks diagnostic and control tools in the firmware, to understand the issue. If those steps do not fix it is likely nothing will.
There is something fundamentally wrong in how the TC is handling routing.. maybe IPv6 getting in the way .. ?? Unfortunately there is simply not enough controls.
The fact that ethernet is affected in this way (though I would do the test with wireless off.. and ipv6 off in the computer as well).. there is little other choice but to get another router.
The TC can be relegated to bridged on the new router.. and still function fine for backup and wireless network for your local network.
If you have applecare on a computer it will still cover the TC.. but I think you may have issues proving the problem.. ie if you take it to apple it will work perfectly.. If you read this forum as I have done.. the SB61xx series modems seem to be a common factor. There is nothing wrong if you test to the modem from the computer but the SB Motorola modem and the TC are incompatible in some way.
I would like you to report the difference in gateway..
When you plug a computer directly to the modem..
Can you please do a copy and paste from Network preferences of the ip and gateway values.
ie this stuff.
Then I want you to get the same stuff out of the TC when it connects.
So we can compare the gateway (Router in applespeak) and if they are different.
How to load 5.6 into ML.
1. Download 5.6 for Lion.
http://support.apple.com/kb/DL1482
Click to open the dmg but do not attempt to install the pkg.. it won't work anyway.
2. Download and install unpkg.
http://www.timdoug.com/unpkg/
Run unpkg on the desktop.. it is very simple.. drag the AirPortUtility56.pkg file over to unpkg.. and it will create a new directory of the same name on the desktop.. drill down.. applications utilities .. there lo and behold is Airport utility 5.6 .. drag it to your main utilities directory or just run it from current location.
You cannot uninstall 6.1 (now 6.2 if you updated) so don't try.. and you cannot or should not run them both at the same time.. so just ignore the toyland version.. the plastic hammer.. and start using 5.6.. a real tool.
For screen shots see this post.
https://discussions.apple.com/thread/4668746?tstart=0

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Are you using 5.6 utility.. it is much better than 6.3 for older model.
A1xxx from the rubber base and then we can know the actual model.
How to load 5.6 into ML.
1. Download 5.6 for Lion.
http://support.apple.com/kb/DL1482
Click to open the dmg but do not attempt to install the pkg.. it won't work anyway.
Leave the package open on the desktop so you can see the file. AirportUtility56.pkg
2. Download and install unpkg.
http://www.timdoug.com/unpkg/
Run unpkg on the desktop.. If your Mac refuses to run the software, because it wasn’t downloaded from the Apple store, go to security in preferences and allow other software to work.. this is limitation of trade methinks. You can set back later if you like.
Now drag the AirPortUtility56.pkg file over to unpkg.. and it will create a new directory of the same name on the desktop.. in finder, open the new directory, drill down.. applications, utilities .. there lo and behold is Airport utility 5.6 .. drag it to your main utilities directory or just run it from current location.
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Message was edited by: 92656iPhone

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OS data&colon; Name = Mac OS X, Architecture = x86_64, Version = 10.8.2
Java data&colon; Vendor = Apple Inc., Version = 1.6.0_37
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Message was edited by: Ollie A

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Time Capsule as router slows download speeds

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