[SOLVED] HELP!!! Cannot Save Changes on Edit Post/Page PHP - WHAT TO TELL HOST TO FIX

I am having this issue again though last time my host solved it, but this host cannot figure it out,

When I go to save changes in Edit Post/Pages area and I do have php code in some of the fields, i get 404 page and no changes will update on the theme.

This is happening on ALL sites on this host, 6 of them, so I know it's PHP issue.

ATA 3.7.3
PHP VERS ON CPANEL 5.3.22

What do I need to tell my host to fix, they are clueless???