I am having what soundls like the same problem but with other sights (hotmail amazon ebay) i am using a isp called Central Point and an actiontec wireless dsl Gateway.
I have rulled out firewalls antivirus etc. as there are 2 completly difrent setups with the same problem.
I went ahead and split your thread out from the other one. Even though you're having a similar problem, your situation might have different conditions or modifiers that may not apply to the original users post. In the future, remember to start your own thread, for the sake of clarity and completeness.