I was outside watching a video on YouTube on my phone because I'm trying to get 15 minutes of sunshine a day, and in the middle of the video, the screen went black, and took me back to the Google search page.
It did this the other day, too. Is there something wrong with my phone? My phone is a Samsung Luna J3.
1) Install Firefox
Just use the YouTube app rather than a browser?
Your browser might have run out of available memory and decided to kill the page.
Also, regularly reboot your phone.