Opmanager failure after migration

Hi there

We recently migrated Opmanager from a physical server to a VM, Win Server 2008 R2, MSSQL 2008 R2, and everything seemed to be going smoothly but lately something occurs overnight to cause Opmanager to go down. No more alerts, and web console shows "Error!" and nothing else.
Restarting Opmanager service fixes the issue (Temporarily) under the next night.
Seems to occur early morning every day around when our Veeam backups are running. Like I said it used to be on physical server so not sure if Veeam is affecting it.

If I could get some support on this that would be great. If there's a support email I can send through licensing info and get the ball rolling.

Regards
Jason