this thing happens with only 1 contact or with every contact? have you checked your internet connection maybe your internet connection is causing this issue
seems like some of the 3rd party apps causing this issue try to using any anti malware apps and identify which app is causing this issue and uninstall that app
I think Samsung has builtin download manager with File manager so maybe you can find your download details there...
But if you want to see playstore's download status then you can check it in Google playstore simply?
Yeah Definitely S8 is such a great phone to buy. Camera Quality and software experience, Speed, Gaming performance everything thing is damn awesome I think S8 is still worth to buy