How to fix 2.2 tmobile tethering problem?

I am a techie guy and usually update my t-mobile vibrant, whenever the updates are released. I am also aware of the fact that we have to regular tether our phone. I am having a t-mobile unlimited plan and usually get a good speed of internet. But suddenly last night I was getting a very low speed and pages were not opening easily. I contacted customer care but that did not fix the problem. Is there something wrong with the tethering? Help

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