Actually occurs when you 'click' on the Thread named 'Forum' to open it (The second Thread named 'Forum' in the Category)
This is a thread in my 'FAQs & Guidelines' Category (naturally prefixed with Forum in the title)
15/3 14:10 [7856] - info: NodeBB Ready
io: 1 emit [ 'event:connect' ]
io: 1 emit [ 'event:user_status_change', { uid: 1, status: 'online' } ]
15/3 14:10 [7856] - verbose: [meta/css] stylesheet.css committed to disk.
io: 1 emit [ 'disconnect',
{ reason: 'transport close',
rooms: [ 'YDukvcdaiSebO5rJAAAA', 'uid_1', 'online_users', 'admin' ] } ]
io: 1 emit [ 'event:user_status_change', { uid: 1, status: 'offline' } ]
io: 1 emit [ 'event:connect' ]
io: 1 emit [ 'event:user_status_change', { uid: 1, status: 'online' } ]
io: 1 emit [ 'event:connect' ]
io: 1 emit [ 'event:user_status_change', { uid: 1, status: 'online' } ]
io: 1 emit [ 'disconnect',
{ reason: 'transport close',
rooms: [ '0lmFnx6niz-6bQCfAAAC', 'uid_1', 'online_users' ] } ]
io: 1 emit [ 'event:connect' ]
io: 1 emit [ 'event:user_status_change', { uid: 1, status: 'online' } ]
[cluster] Child Process (7856) has exited (code: 1, signal: null)
[cluster] Spinning up another process...
Above is me restarting the server , waiting until it's ready and then clicking on the Thread named just plain 'Forum'.
As you can see it restarts the server every time I do this.