It happens frequently in Elite Dangerous. I open a browser window, place it somewhere and after a while (after around 15-20 mins) the window either disappers or it is relocated far-far away from the cockpit, beyond my reach. (I detected it two or three times somewhere outside the windows about 100-150meter before me. (judging the distance by my ship)
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Same here in elite dangerous. It's unusable. The sound keeps playing, but the screen disappears.