Based on the errors, it appears you have something/someone trying to trunc the log.
the steps you listed are unnecessary to resolve the issue.
Find what is truncating the log and make sure nothing is switching your databases from full -> simple -> full.
Oh, and get your maintenance routines switched from using the Maintenance Plans and start using scripts.
Jason...AKA CirqueDeSQLeil
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I have given a name to my pain...MCM SQL Server, MVP
SQL RNNR
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