Thanks for the note here. It's hard to say what may be occurring. I have a few more questions to try and better understand what you are seeing:
1. What channel(s) and what content are you watching on your Roku device when you observe it returning the home screen? 2. Does this issue only occur when you are watching that/those channels? 3. Have you tried: 1. Removing the affected channel from the Roku home screen, 2. Restarting your Roku device completely, then 3. Adding the channel back once more and streaming again? 4. Have you tried connecting your device to a different wireless network and streaming to see if you encounter the same issue?