Zyxel n4100 certificate error

Our customer has a hotel with wifi access points all converging towards a Zyxel n4100 hotspot
Since the beginning of the month, they are receiving the following error when they try to browse: "Can't connect securely to this page" or “Your connection is not private”
They also obtain a message indicating the the certificate used by server is invalid.
This only happens with Google Chrome version 67 onwords. Something regarding the HSTS security.
Any ideas on how to bypass this situation?
Steven RothwellIT ManagerAsked:
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What is the status of the SSL certificate on the WAP? Look into that, and fix the issue. Screenshots would also be helpful.
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