Crash on reboot

Crash on reboot

Our production instance has recently started crashing when the server receives an update and has to restart. Shutting down the services and restarting the server won't work. Problem seems to be with MS SQL connections. If I stop the services and have the DBA close all active connections, a reboot then starts everything immediately. Error logs mention not being able to make connection. 

We're on 9414 would this be a bug or is this a known issue? It doesn't happen in out dev or test environments. Prod is MS SQL 2016 in a clustered high availability config.

Anyone?

Thanks

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