Wifi works for short time

Dear readers,
Since a few weeks my wifi / airport on my Macbook stops working after a few minutes. I can temporarily fix this problem by turning off and on the Airport function, but after a few minutes it kicks me out again.
Other details:
Cable works fine.
Full wifi bars at all time.
Not a router issue. Other devices work fine and problem occurs both at home and on work.
I recently updated to Mountain Lion, problems started to occur around this time. (not 100% sure)
Problem still occurs after downgrade from Mountain Lion 10.8.3 to Snow Leopard 10.6.8.
Examples: (I have the feeling that has something to do with bandwidth usage)
Browsing the web is possible for about 5 minutes.
Youtube video stops loading after 2 minutes.
Any kind of download works for 30 seconds.
What I tried:
Simple reboot
Software downgrade
Creating a new network location
Manual IP
Change DNS server
Change MTU
Some reset by pressing cmd/ctrl/shift/power during startup
I know that i'm not the only one who is having this problem. But i really hope that this (extra) post will get some attention from Apple.
Thank you for your help.

Try the basics first:
   Change your router channel number.  Most times this works & is all you have to do.
Disconnect & reconnect your modem.  unplug it for about 10 seconds.  Plug it back in.  Do the same for Apple’s routers.  Wait for everything to reboot.
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Research Knowledge Base for network problems that pertain to the OS that is currently installed on your computer.   See these basic networking KB Articles:  http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
============================
What to do when you can't connect to the Internet
Also, run the Airport Utility app which is located inside the Utilities folder.
=====================
If using a  Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.
=============
But i really hope that this (extra) post will get some attention from Apple.
These are user-to-user forums where everyday folk (volunteers) post questions and offer answers (technical support) to each other.  Apple does not read nor post on this message board.

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