Why would a web form (using PHP) only work sometimes?

M

Mystery

New member
The form works most of the time but every now and then when the submit button is clicked, it returns the error page and no email is sent out. Validation was done with with Javascript and PHP.

Is it most likely a HTML / PHP script / servers issue? I tested with more than one email address. How can I ensure a website form is almost foolproof?
 
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