Disconnected from XBox Live once game starts

Hey there, please take a few minutes to read this post, and then answer the questions in bold. Thanks!

What Country/State/Province do you live in? Colorado

Modem brand & model number: Not a modem issue, internet works fine - 4bars before I start to play

Router brand & model number: Not a router issue, internet works fine - four bars before I start to play

Network Connection Type: Wireless/Wired Wireless

If Wireless, what type of encryption are you using? secure line

Things you have tried: Resetting modem and router, clearing memory cache, re-setting settings to factory settings

Is UPnP Enabled? Yes/no/Unknown Unknown

Is NAT Type Open? Yes

Any Error Codes you encounter: None

What type of internet do you have? Cable/DSL/T1/3G? Cable

Who is your ISP(Internet Service Provider)? Comcast

When you run "Test Xbox LIVE connection" what is the exact message shown on screen? None...then I get kicked off and get low MTU (sorry, can't remember the name), however when I check my status on line, I have 1,675 (although I have no idea what that means)

Thanks again!

If you're getting an MTU error consistently, then you'll want to take a few minutes to read this guide and try the steps listed there.

Thanks for the tip sheet, however, I have tried the above previously.  I only get the MTU message when I try to test my connection after getting kicked out and after starting the game.   When I test my connection before playing a game, I have no message and my connection is fine.

Maybe I'll rephrase the question and see if that helps.  My system worked correctly until I tried to download a course for Tiger Woods.  I never got the course.  I called support and was told to reset my system to factory defaults.  That worked!  Every once in a while I would still get disconnected (never in game, only at credit screen).  Clearing the memory cache solved this problem.  However, last night I tried to download the new expansion packs for Black Ops.  I received an error message, maps did not download, and I checked out the support for that error (8072EE2).  The solutions told me to go to my  download history, but the XBox froze when I did this.  When I tried to pop back into Black Ops, I was disconnected again.  When I tried to check out my download history, the XBox froze again.  Repeat cycle as necessary.

The only solution I have not tried is connecting directly to the modem, however, that is not possible as my gaming console is in my living room and my modem is in the basement of my house.  Any other suggestions?

Have you tried accessing your download history with your HDD removed? If so, does the same thing happen then? (You may need to use a flash drive configured for use with Xbox in order to do this.)

Thanks, I'll give it a shot

your internet connection might be to weak to support that much.

Thanks for the help, all, I appreciate it.  Little embarrassed about this, but turns out the TurtleBeach headphones were interfering with the signal.

Thanks again