The ERR SSL PROTOCOL error has no obvious reason for popping up on any website at any time. It could be due to server issues or sometimes even an inaccuracy in system data or time. Try clearing your SSL State and clearing your browsing data regularly. Check your antivirus softwares settings, see if it is scanning the SSL/TLS protocols, disable it and see if the error persists. If the fault is not fixed, you should try disabling the QUIC Protocol.”]
Source: https://hackercombat.com/quick-guide-on-how-to-fix-chromes-err-ssl-protocol-error/