Hyper V guest saving and restoring every hour - disconnects users!

Hi,

I have 1 Hyper-V Server 2012 R2 host with 1 VM (also running Server 2012 R2). From today, the VM saves and restores every hour which results in users being disconnected. During this time I am unable to RDP or ping the VM. Once the restoring process has completed in Hyper V Manager, I (and users) can then connect to the VM. The VM doesn't restart during this time, as my desktop loads up as it was before.

Any ideas whats going on? I've checked through the logs but can't find anything mentioning what it's actually doing. 

Thanks in advance.