While streaming a show, roku starts buffering, and then one of two things happens: 1) screen goes black and program i was watching then restarts from the very beginning or 2) after the buffering it goes to the previous screen where i originally selected the show, and i have to reselect to continue watching from where it left off. This happens regularly and while streaming on both netflix and apple tv. I have a roku premiere+ and 100 Mbps cable internet service. Any ideas what's causing this? It's really annoying!