Uses up a lot of processing power

About 15 minutes after I posted this, things went back to normal.  I'll keep this in mind if it creates problems in the future, though.

For some reason, AVG tends to use up between 50 and 75% of my computer's processing power, at least according to Task Manager, which rates AVG's CPU use at around that average.  This is when I'm not having AVG scan my computer or even do anything at all.  My computer starts out fine, with AVG using maybe 10-15% of the processing power.  But after an hour or so, AVG is using up the vast majority.  I can't figure out why or how to fix this, and my computer won't allow me to close AVG to free up resources.  Has anyone else had this problem?  And if so, can someone recommend a solution?

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About 15 minutes after I posted this, things went back to normal.  I'll keep this in mind if it creates problems in the future, though.