The first couple of weeks using the Xfinity Stream app on my Roku streaming stick was fine. I notice for the last two weeks it keeps dropping sound. I have to back out of the channel and go back in to get the sound back. Sometimes it happens more in the morning than in the evenings. I thought it was a connection issue with my wireless network. I purchased a range extender to provide more coverage in the area where the Roku is. I went from good to excellent connection, but the problem still persist. Any help is appreciated.