D-link slow connection problem

Hello everybody.
I just buy a brand new D-link Wi-Fi Router and installed it in my home.
But when I try to connet to wireless thats happen:
First click to some link: Super connection no problem
Second click: Little slow connection but no problem
3th click: Very very slow connection
4th click: no connection (but Wi-Fi is still connected with full connection status), or keep slow working.

When I dissconect and connect again everything goes to start again - fast connection, slower, slower, no connection.
What happen?

I am sure I installed the Wi-Fi correctly, and this model is very very popular.
I have no chance to check with other wi-fi devices.
I read that I need to set registry to working with G router, but where in the registry exactly?
If there any third party programs to connect with wi-fi for smartphones I will try it. If there are any connection setting for router or for phone i will try it.

Thank you.

I am having the exact same problem now. Did you get any help?

Hello. I resolve my problem just to set Wi-Fi Power mode in phone to full performance.