Anyone else having Site problems?

[MoviePropMaster2008]

I keep on getting this error message and it's canceled a bunch of my edits

Error 503 Service Unavailable

Now I know we had to move to new servers because of bandwidth. Is it because of more traffic, i.e. more people in the world are checking out the site? Or is it something we can fix on our end? (adjusting how we do things on the site? ) I'm trying to delete a bunch of old unused files just because they take up server space, but being that they aren't linked to any pages, I don't think they impact 'bandwidth usage' all that much.

If any higher ranking SYSOPS can shed some light on this, it would be much appreciated.