You're on wifi and are experiencing high PL in Extreme Games (or in any zone) not allowing you to play.
When the solution usually fits:
You live in an apartment, or close to neighbors that have wifi. Or you're in an area that has a lot of private and public wifi networks broadcasting.
Change the channel your wifi broadcasts on. This can be done by logging into the admin interface on your modem/router. Google your router's brand/model "admin interface" to see how to access it (usually by visiting 192.168.0.1 or 192.168.1.1 or 10.0.0.1). If you've never visited this page before, it's most likely going to be a default username and password (which you can also google). Once you've logged in, find the section that manages your wireless settings -- be aware you may need to click "advanced" for additional settings. Look for a field called "Channel" or "Wireless Channel". Most often this is set to "auto" or "1". Try changing it to another channel like 8 or 9, apply the settings and then restart your router.
This took me from about 4% PL to .3% on wifi. For netban it took him from around 12% PL down to .7%.
Hope this helps!