A lot of people run into issues with Veeam and the cause can sometimes be the Consolidate Helper. Here is an explanation from Veeam.
“it is automatically created by ESX host during snapshot management process. Whether the job fails due to an error, or manually stopped, Veeam Backup goes through the same (and only) cleanup procedure that would remove snapshot we have created during backup (“VEEAM BACKUP TEMPORARY SNAPSHOT”) – you can easily confirm this snapshot appearing first, and then disappearing.”
So basically you should disable any Veeam jobs that are scheduled and remove the offending “snapshot” Be wary though that when removing a snapshot, it can hog the disk on the ESX host, and in-turn may cause issues with any servers on that host.