Got message about Lock Lost. What does it mean?

On Windows Client, got a lock lost message, about a lock on a specific file is broken, and whether you want to grab the lock again. What does the message mean?

How the lock works:

• When the distributed lock is on (it is on by default), opening a file in the Windows client will lock the file automatically. It will prevent other users from modifying the file. Once you close the file, it will be uploaded to the cloud and release the lock.
• While you are working on the file, the Windows client will keep the lock heartbeat with the server to maintain the lock. If the server hasn't heard from the client for 15 minutes, it will assume the client is gone and unlock the file, to prevent the file from locking permanently
• The error message means that while you still have the file open, you have lost the lock now. And it gives you the option to lock the file again.

Possible cause:

• Tenant admin can release the lock from the web portal directly. 
• When you have a file open and the machine goes to sleep, the Windows client doesn't send a heartbeat message anymore.
• You have a network issue, which prevents the Windows client from communicating with the server for the heartbeat message. 

Solution:

• If you are still working on the file, just click 'yes' to grab the lock again.
• If your machine doesn't go to sleep, please check your network connection.
• As a cluster admin, you can define how long the server releases the lock when it doesn't receive the heartbeat message.
  
  Go to Cluster Dashboard -> Cluster Settings
  
  

  On the Timeouts and Limits tab, you will see the setting Distributed Lock Idle Timeout.