app (dolphin browser) goes off or not?

I'm using android dongle to play some video on big screen, and because of three features i decided to use dolphin: * html5 support * full screen mode * html5 video autoplay

Everything works perfectly, but after about 2h - doplhin goes off, and on screen is desktop. When I run dolphin - again - homepage opens, movies are playing between 1h20m and 2h...

I'm not sure if dolphin crashes or just go background - so i don't know how to fix it.

If somebody knows any browser better than dolphin - I can change it - this was first and one for now which can autoplay video. Any others waits for user touch (which is so stupid... I should be a parameter - autoplay on/off, off by default)