Could be your browser not allowing cookies, could be a 3rd party cookie authority extension, could be your Joomla sessions are being purged for whatever reason, or could be caching from your site. It's an issue that can have over a dozen causes. Unfortunately we've no way of really fixing it. Basically the anti-spam/spoof token has been lost and can't be compared against which causes the anti-spam/spoof checks to fail.
You can try turning off spoof checking within CB > Configuration > Integrations, but it's recommended to review the listed things above and see if any of them could be the cause.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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-- My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.