Band width reaches limit problem.
First check the bandwidth for the particular domain using “View Bandwidth Usage” option.
if bandwidth limit is exceed then resolve the issue.
For resolve this issue.
Login to that hosting control panel.
First to create one new package with higher bandwidth.
After create new package.
Using “Upgrade/Downgrade an Account” option move the domain into new package.
Then open the domain in the browser the site will be loading perfectly