SQL Backup always hang and made VM running on Host (ESXI) unresponsive

Hi All,

actually, we have WS 2012 R2 running on VM with service SQL server 2012.

- The host hangs while backup SQL (we use SQL Tool to backup DB with total size 3TB) we are doing differential backup on weekday and full backup on weekend. The host and VM Utilization is fine (60%) and it happens once a month for this issue. the resolve only shutdown the host and power on. 

Any idea on this problem. Hope you have a comment and suggestion on this.

Thanks you

Sunsami