Server Version#: plexmediaserver_1.19.2.2673-776106bc6_amd64
Player Version#: (old) Samsung 2012
After upgrading the server to 1.19.2.2673-776106bc6_amd64 Samsung app in my old (2014) TV finds servers but it is unable to show content of libraries and keeps frozen until exit button is pressed. Reinstalling app does not sole the problem
Downgrading to last stable version plexmediaserver_1.19.1.2645-ccb6eb67e_amd64 solves the problem and everything keeps working