Why does the mounted ball fall off on ubuntu 14.04?

Question

ubuntu

There is a cluster ball based on windows 2012r2.
There is a server based on ubuntu 14.04, on which a folder with cluster balls is mounted.
The problem is that sometimes the ball falls off. When you try to go to / mnt MC just hangs.
This behavior began to appear precisely on the cluster ball. On a regular ball, everything works stably.
There is a suspicion that this is due to the periodic restart of the cluster nodes. Could this be?