Some Internet providers supply their own branded version of a standard browser with a setting in the browser to limit the time of the connection. If you have a branded browser, check for this type of setting. Old cached web pages can cause problems. The steps may differ depending on the particular version of browser you are using. Always close your browser and re-start it after clearing your cache.
Cookies are small pieces of information stored by the browser.
Sometimes bad or old cookies can cause problems. This effectively clears your cookie information while creating a backup that you can revert back to if need be. Avoid using a modem connection of less than 28.8 . There may be something non-standard about your Internet connection. Ask your Internet provider.