Why does Hack Alert keep getting turned off and prompting me to 'turn on'?

Why does Hack Alert keep getting turned off. Every time I turn on my device, it is prompting me to ‘turn on’.

Avast also says it is doing regular Smart Scans which it says are clean, as well as scans I do manually, and yet periodically tells me I have not done a scan for weeks??!!

I was considering buying the product - now I am not sure at all.