The other night i discovered in the settings of avast there was an option to toggle off having my usage data passed onto 3rd party analytics so i turned the option off and clicked ok to save the option but when i went back in today because i was going to see what the other option said as i had forgotten it i noticed the 3rd party analytics option had mysteriously turned itself back on.
i've figured out that it reverts back to on after i exit the settings mention and go back in.
i'm on the latest version which at this minute is 18.6.2349, ran some scans and nothing was found
Windows 7 SP1 64bit premium