Our site is having problems with Ajax errors when customers click the add-to-cart button. This is a relatively new installation. It doesn’t happen on every product and not all the time.
The below link is one of the products that is pretty consistent with the error. If there are not items in the cart, it gets the ajax error every time. If there are other items then it will usually work.
https://www.softwarediscountcenter.com/shop/intuit-quickbooks/quickbooks-pro/
Is there a setting, or something I should be looking for?