hi

yes, I did send a question about this to Sony Support but their proposals were either useless or simply wrong. Not really happy with that experience.

However, I got my problem solved by following the instructions on this thread: 

https://community.sony.fi/t5/android-tv/home-button-not-working-after-last-firmware-update-sony-55xd...

where there was the same problem and the solution was to go to settings via user help/manual, and restore the factory settings, which corrected this problem.