Changing from default could mean you miss other important messages that may happen, especially if the error is fixed in the next firmware refresh.
If you wish to change logging level,
Try:
Default message log level: – Leave as is (Notice, I believe is default)
Log any messages more urgent than: – change to ‘Error or Critical’ (not sure which one will remove offending log entries) ?
https://en.wikipedia.org/wiki/Syslog#Severity_level
Note: if that does not work, then trial and error I am afraid 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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