could you please contact AVG technical support, which has more tools to help you with described situation?
Please go through this webform www.avg.com/ww-en/customer-support
Or use the option in AVG -> menu Help -> Get Help Online
Else the daily scan is possible to disable through AVG Admin (if you are using more stations) and then just synchronize the settings with stations. Has AVG scan used the user_sensitive priority?