My Roku remote - not voice controlled - has been working intermittently the past few weeks. Whilst watching Netflix or anything really, suddenly the remote does not respond when I press a button - any button. I switch to the Roku remote app on my Android and it works for a bit then it does not respond when I press any button. If I close the app on my phone and try again it might work for a few minutes. Why is this happening all of a sudden and is this a wifi/network issue?