In my case it was the Navigation Bar, but other people in forums have this same issue in different areas of the touchscreen too.

Most people hate the Bixby feature on this phone

I see some people are unhappy that carrier visual voicemail is unavailable from the play store for this unlocked phone (and the s8) but it IS possible to get it working

Some people actually LIKE that there are no screen wakeup on Notifications

Some people are like me and would want notification - just can't get them.3

The Samsung customer service reps have to be the stupidest people I have ever dealt with for a tech company

Some people complain about

Some people might be disappointed by the 4GB of memory, but the vast majority of users will never feel the difference

I also got the Notification tones when I turned on/off the Voice Assistant for blind people to use the phone