When I boot my PC, avast starts up and is on the tray and display the icon,
but monitoring service is in 'OFF' status. So I should turn this on manually.
Sometimes it works fine with 'ON' but many times it is in 'OFF'.
This have happened for about 2-3months.
More info. : Full scanning from Avast had been done, but no results. But still I doubt malware or some serious security problem, so I tried 'Malwarebytes' but it didn't work at all for no reason, even I failed to execute the application(It says 'fail to connect to service').