Last few months, no matter how much time I spent contacting my ISP support, resetting & configuring the equipment, I still couldn't find solution for my bad wireless internet connection.
Finally today, after so many lost days in pain and suffering for teh internets, I found the secret how to fix it
I applied new security for my network:
...
Wireless Protector v.1.0 
Disadvantages are shitting and peeing under the routers, but with proper configuration, this is going to be solved too.
