Netflix has two autoplay features. One automatically plays the next episode in a series and the other autoplays previews while browsing. Personally I like the first option. When I’m binge watching, I like having the next episode begin without having to do something, though I can see it might might annoy some people. I don’t like the other option which autoplays a trailer while I’m browsing.
The good new is that Netflix now allows you to turn off either or both of these “features” and he’s how.
On a PC or Mac browser
Go to Netflix.com
Login and select Account just below your login thumbnail image
Scroll all the way down till you see Playback Settings and click on that link
Uncheck which ever option you want to disable
On a smartphone
Login to Netflix on the phone’s browser (you can’t do this on the Netflix app)
Click More in the lower right corner
Click on Account
Scroll down to Playback settings (near the bottom)
Uncheck whichever option you want to disable