Java has stopped working

I was playing minecraft and then paused, pressed win key to open start and then I opened chrome. After 5 minutes of browsing in chrome I wanted to go back into minecraft but it just says "Java has stopped working". There are no errors in console.

EDIT: Minecraft is using 100% GPU when browsing in chrome
EDIT 2: If you leave it long enough it will start working and the longer you do something while minecraft is running in background the more it takes to start responding again.
EDIT 3: Uploading the video now
EDIT 4: https://www.youtube.com/watch?v=is5SL1MEgpc