Same basic situation here. I just upgraded to the same IntelliJ version as the OP, with the same version of SonarLint, though our server is at v7.7. However, the symptoms at our company are slightly different. When IntelliJ restarted after the upgrade, the following, and only. entry was in the event log:
2:38 PM SonarLint - Invalid binding
Missing local storage for connection 'Production SonarQube Server'
Please update the binding in the SonarLint General Settings