One of our servers is getting the SQL Server Agent job that does transaction log backups disabled with no apparent reason. It has happened sporadically, twice in the last 30 days or so, precisely after 3:00 AM. So, the question is: Has anyone ever experienced specific SQL Server Agent jobs being disabled spontaneously like this? (It's obvious something is disabling the job automatically.) Does anyone have any theories why/how this would happen? Any insights appreciated. Best, Raphael.
There are a lot of things to look at, but what I would to first is, enable an extended event or a SQL Audit that captures the events related to SQL Server Agent jobs.
There is already a good question about that on here:
And also check for last modified date:
select name , enabled , date_modified from msdb.dbo.sysjobs where enabled = 0