I get this error sporatically. If I refresh, it goes away.

I get this error sporatically. If I refresh, it goes away. I am leaning toward a server issue (I am not even close to using my allotted memory or anything like that).

I am running the latest versions of everything.

Any ideas? I will be changing hosts but while setting up, I'm using Network Solutions basic cheap model.

This is the error:
500: Internal server error

This error is generated when a script running on the server could not be implemented or permissions are incorrectly assigned for files or directories

Troubleshooting suggestions:

Temporarily disable any rewrite rules by renaming your .htaccess file if it exists.

Ensure that any CGI or Perl scripts have at least .755. permissions.

If trying to run PHP and you get this error, you may have an invalid php.ini in your /cgi-bin, or may be missing your php.dat file in this folder.

The site is negotiari.com

Thank you
Angela