Re: NO keyboard response in game.
Had a similar problem, basically was alt-tabbing back and forth to chat on steam. and after the last alt-tab back in game mouse worked fine but no responce from keyboard ingame whatsoever. pressing alt-tab once solved it (for some reason game didnt recognise that i properly got back in.
Just my 2 cents not sure if it helps or not since you say system freezes after you alt-tab.
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