cappage ay?
Best thing to do is to change your MTU settings in modem/router.
Basically what you do is login to your modem/router by typing its IP into web browser (mine is 192.168.0.1), logon details should usually be at the bottom of the modem/router. In my case my login is Admin and password is whatever is set it to

Then have a good look around everywhere in the settings for MTU, and change that to 576 (usually works), default should be 1500
cheers,
Minski