Sometimes when adding a product to the cart you are presented with a 404 error. This happens when a session expires but is not limited to customers who are logged in.
You can replicate this by adjusting the zenid cookie and clicking 'Add to cart' on a product page.
I've adjusted the init_sanitize.php file to direct to FILENAME_TIME_OUT as opposed to FILENAME_PAGE_NOT_FOUND which is obviously more helpful but it doesn't explain why this would happen randomly. It only seems to happen when visiting the site again much later in the day or when the session has actually expired.
Should this not try to combine the zenid provided in post variables to the cookie, rather than simply throwing an error? A lot of my customers are reporting that they can't add products to their cart page...
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