Pausing anything outside of roku automatically revers to roku home
Sling, Hulu, Pluto, Merritt - does not matter which venue I am on. I pause what I am watching to go get a drink, come back and I am on the show I paused is gone and the Roku screen saver is on. Press continue and it may go to Roku or revert back to the venue I was on. It never goes back to the show I paused. Timing this shows it to happen in 1 minute to 1.5 minutes. Why?
For how long it takes for the screensaver to activate, you can disable it completely or set it to 1, 5, 10, or 30 minutes under Settings->Theme->Screensaver start time. It sounds like yours is set to 1 minute.
For the other problem, when you say you're pressing "continue", what button are you pressing? If the screensaver is active, don't press Play/Pause (which I know is intuitively what everyone does). Roku has screensavers with little ads that float past and pressing Play/Pause will activate the ad. Get in the habit of pressing any other button while the screensaver is active and then you can press Play/Pause to resume your video.