I don't know if this is the cause, however the Emergency Update check uses the task scheduler to check and see if an Emergency Update is available, if so would install it, if not it closes.
The frequency I believe is shortly after you first boot and or twice a day.
It has been like this for some considerable time.
If you are quick when you boot open the task manager and you may see the AvEmUpdate.exe process running, but it isn't there for long unless there is an Emergency Update available.