I have a roku express which has worked perfectly until now. When I change from my tv source, to my roku source (hdmi),there is either white static or a black screen with sound. In other words, I am watching a tv show on roku, then I hit channel 2 on my remote to watch local tv, then hit ok on my roku to resume watching roku show, the issue happens. I have unplugged from wall, unplugged hdmi, no change. I then have to unplug roku to get it to work again Thanks.