We are having the SAME exact issue here. Server is a 08R2 SQL server with 16gigs of RAM and 8vCPUs. This is our most mission critical server, so we are doing Veeam backups every 3 hours. Not every backup causes it. Its more like 1 in 4 causes this. The VM will lockup for anywhere to 1 minute to 15 minutes, which is obviously a HUGE problem with 100+ active users. Please let me know if I can help get to the bottom of this.
Thanks,
Richard