For an issue like this that will undoubtedly involve some investigation please open a case with PTC Technical Support on the PTC Support Portal so we can take a deeper look at the issue and evaluate the logs thoroughly.
This will be the most efficient way to provide a diagnosis and next steps so we can get you upgraded to 7.4.19.
We tried once again tonight, disabled HA, route all incoming traffics to another server. Unfortunately, it is running for 4+ hours, and deadlock occurred after 2 hours running and locked up until now.