Why are my web shields always turned offf every morning???

Why are my web and all shields disabled every morning I turn on my PC??? I have not changed anything in settings,and I have not done anything new to my PC . Just wondering what is the issue with the shields disabling themselves every morning.

Are you getting any other errors displayed to the screen ?
What Operating System are you using ?
What avast! version are you using, 17.5.2232 being the latest ?

Have (or did) you another Anti-Virus installed in this system, if so what was it and how did you get rid of it ?