AVG using 50% of CPU

I have the basic AVG free, running in Windows 7 64-bit. Today when I got on my computer after leaving it running for 18 hours, it was very slow. Task manager showed AVGUI.exe was using 50% of CPU. What gives? It seems ok now after a reboot.

Hello John,

I understand the inconvenience. Your patience and cooperation are highly appreciated on this matter. Please repair (http://support.avg.com/SupportArticleView?urlname=How-to-repair-AVG) AVG program once and follow the below steps to fix the issue.
Click on Menu->Settings->Troubleshooting->Uncheck "Enable AVG Self Protection Mode" and check the status.

Please do contact us, If you face any difficulties.

Thank you.

Hello John,

I understand the inconvenience. Your patience and cooperation are highly appreciated on this matter. Please repair (http://support.avg.com/SupportArticleView?urlname=How-to-repair-AVG) AVG program once and follow the below steps to fix the issue.
Click on Menu->Settings->Troubleshooting->Uncheck "Enable AVG Self Protection Mode" and check the status.

Please do contact us, If you face any difficulties.

Thank you.