What all possible times 'kazoo.exceptions.ConnectionLoss' is raised?

I am using apache-zookeeper and kazoo framework for one of my requirement. I have a simple zookeeper cluster setup and few clients connecting to server cluster to read node information. I am facing kazoo.exceptions.ConnectionLoss randomly(once in fifty times). My concern is on what all times this exception is raised ? Below are the points I thought.

• Connection to server was lost
• Server didn't respond back within timeout set in server configuration

Can there be any other reasons for this exception? I don't see documentation explaining anything in detail on this.

I fear I don't have ready answer but looking at Kazoo code I think this can come in following conditions,

• Socket read timeout,

• Socket write timeout,

• deserialize failure because of timeout issues,

• Client creation with high initial bytes value of node

Tried to gather this from Kazoo unittest code test_connection test_client ,