This is very similar to:
https://forums.bohemia.net/forums/topic/188231-nfo-156-update-disables-steam-api-initialization-on-vds-instances/
https://forums.bohemia.net/forums/topic/188192-server-linux-156-strange-issue/
It may have the same cause.
The main difference this time is that logs are not being created by the servers that hang.