My first suggestion is to to a power cycle. Simply turning the TV "off" doesn't do that. Go into the Settings menu, find System/Power, and do a System Restart. An easier way is to simply pull the power cord for 10 seconds or so.
Dan
Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.