system
3
It appears that the problem with Avast Mobile storage scan is not just with me, since my sister has it to in her phone. Also she told me that Samsung Galaxy freezings were what happened to her Samsung Galaxy S3 when it became two years old, just like mine about now. 
One thing that’s left to debate is the issue of “Unusual traffic” notice by Google, since I’m not sure if it was caused by something nasty within my phone or bad connections or something… :-\