All of my apps on Sharp Roku TV have disappeared

Same problem just happened with my 2 month old 43” ROKU TV!  When I turned on my TV the only thing I could access was my network connection.  No Home Screen, can’t access settings, no apps showing.  I unplugged TV, waited and plugged back in again and all i have is the screen saver.  Voice command will take me to a channel, but no channels or apps show on the screen. And voice command for Home settings reads,   “Sorry. Screen Navigation is not supported