If I read your posts correctly you are leaving the game running open on your computer, rather than closing it then reopening it when you return. Are you absolutely certain no-one can get at your computer while you are not there, even a pet? ISTR someone posted here a while back about a pet puppy messing up their game!

Also, why do you leave it open, rather than close it?
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To err is human; to arr is pirate.