This is what I found from my search:
The correct answer to this problem is as follows:
1. You must go into your router.
2. Enter the setup section.
3. Select MAC address.
4. Select user defined.
5. Change a few numbers and letters in the MAC address.
6. Save settings and reboot your computer and reset your MODEM.
This problem occurs when viewing the same site over a router from more that one computer or application at the same time for a period of time. This activates something in the server software that puts your IP address on a so called "BAND LIST". Your web hosting company will not be able to correct it because they don't know what is going on because they can see that it is working fine from their point of view.