For some reason the roku remote app isn't finding my roku devices to connect. It has always worked before. I can use the app on my son's tablet, but it's suddenly not working on my phone. I went into my roku account and it still has both of my roku devices listed, but when I try to connect to device, it says none found. I deleted the app and reinstalled it. I rebooted my phone. Not sure what else to do. Why is it working on my son's tablet, but not my phone, when I previously had no problems?