There are different posters describing slightly different symptoms. You should try to get the obvious things out of the way. There is a post about what sounds like the client or system freezing, and another about the screen itself freezing (and going black when minimized/restored).
Like I said, try to get some easy troubleshooting things out of the way.
1.) Are you graphics drivers up to date?
2.) Attempt to run the game after booting your computer into a selective startup environment. Typically access through msconfig. Google your operating system + selective startup for instructions on how to do this. After making the quick settings change, you will be prompted to reboot. Does the problem persist? If not, something is interfering with the client or graphics (some overlays, etc).
3.) Thermal issues with either the processor or gpu can certainly cause these types of problems. It is a warmer time of year right now anyhow. Your processor may be thermal throttling (a safety feature built into some processors to try to prevent damage), or outright overheating due to inadequate cooling. Your gpu fan could be clogged up with dust, have bad/old thermal compound, etc. The fan may not even be turned up (a feature to alleviate noise). You could try a program like 'Core Temp' to check in on your processor/core temps. Remember to run this under stress. Since you are having problems with the game, run this while running the game for awhile, and see what temperatures you are getting. If you have AMD, Nvidia or ATI graphics card, you might want to look into 'MSI Afterburner'. You could check your temperatures, and setup a fan profile that automatically increases/decreases your fan speed based on given temperatures. For other graphic manufactures, you will need to find other software to give you your temperatures, or dynamically adjust your fan speed.
I think anytime your monitor goes blank, but you can still hear (non looping) sound, it's extremely likely you are experiencing a graphics card issue. That could be hardware related (failing card, overheating), or software related (conflicting controller software, driver issues). Because I read that the "screen froze", and didn't go black, I am not considering an issue with the monitor itself. Anyhow, just some things to check. Post again if you can think of anything else, or you have tried the above suggestions and have anything further to report. Good luck
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