Receiver changes programs on its own
HR54/700, Samsung 55UH6300 (Nov 2016 manufacture)
Most recent 2 situations were yesterday.
1. Using TV app to watch Amazon 4k video, screen switched to DirecTV box a few seconds after Amazon program was started.
2. Using DirecTV Pandora app, system dropped it and went to most recent channel we were watching.
What's happening, and how do I prevent this behavior?