Every 2-4 hrs I am getting auto Product & Anti-virus updates. Clicking the Quick Tasks 'check for updates' or Overview->Preferences 'check for updates' will also give an AV update along with the expected Product update. Setting the Overview->Preferences 'check for Product updates' to manually will stop the unified Product & Anti-virus updates and I will only get AV updates at whatever update frequency I have selected.
On 9/4 zorkoff started a thread in the ZA Configurations Forum that sounds similar, but he got no replies. I was also seeing this issue in 8.0.400.020, however it presented itself a little differently and I couldn't understand what was going on until I installed 9.0.083.000.
This is more of an annoyance than a broken system and I can set the Preferences 'check for updates' to manually and regularly check the forum to see if there are any new version updates or set the Anti-virus update frequency to 24 hours and let the rouge Product/AV updates be the driver for when I get updates.
There must be others who have this issue but are ignoring it or are not aware of it. As a lone-voice going to ZA Support isn't going to do much good, I would probably get the uninstall/reinstall suggestion. Since it's a carryover from 8.0.400.020 to 9.0.083.000 I don't see any point in reinstalling.