hi, this shouls help your problem
In Plus! there is an option to show you away after period of inactivity. Take a look at Preferences - General Options - Miscellaneous - and tick the box 'Automaticlly change status....'
Don't know why the messenger auto-away sometimes just stops working, but it has nothing to do with Plus! ,happens to my friend too, and she does not have Plus! installed.
All the best buddy
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