System Crashes

When playing the new Beta version of Minecraft, when I switch to another window (usually the insider hub) I can do whatever I have got to do but when I return to Minecraft, the pause menu is active (expected) but I cannot click on anything (game frozen). When I then close the m
Minecraft tab, the whole computer crashes and restarts. Once restarted, I can then load up the game again and carry on as normal until I switch between active windows which causes the freeze again.