MN820 Slow Internet

I have begun experiencing extremely slow internet
connections with the MN820 kit. It has worked fine for 5
days. Now I lose my internet connection after
experiencing slower and slower connection speed.

MY ISP states they have no problems at thier end.
Unplugging the base station helps for a while but the
slowdown comes back until I finally lose connection.
I lose conncection on my desktop and on my wireless
notebook.
Any help appreciated.
Thanks