I have the same problem but what i did was to change the dns setting to an open dns.

Just type in

208.67.222.222
208.67.220.220

I m using P1 Wimax and the signal sometimes good sometimes not so good same as streamyx i guess! I was told that unless our country change our fiber optic cable to optical we be stuck for 2-3 bar of signal FOR LIFE!!!!

Hope my solution solve ur problems...