Roku Hisense TV keeps turning on and off

My Roku Hisense T.V.  just keeps turning on and off since I got an update last night. It will go to home screen and I'll go into an app but then after a few minutes it will just go back to turning on and off again. I tried unplugging it for a while and plugged it back in but it just started happening again. Currently it's been doing this for about a half hour now. Has anybody else experienced this now or in the pasted and does anyone know what's wrong?