Crash after a few minutes of play, every game

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Hi. I'm having crashes happen a few minutes into the every game. The graphics will freeze and the sound will loop, however, if I try alt tabbing I get a blank screen and the sounds actually start playing as if the game (or at least the sim thread) is still running. Ctrl+Alt+delete brings up the open task manager window, but I can never see the task manager, only a blank screen. I have no choice but to restart windows.

I've searched for and deleted game.prefs this didn't help. The only line in the log files that looked out of place was this one:

warning: c:\work\rts\main\code\src\libs\gpggal\DeviceD3D9.cpp(937) Device lost

Here's a little more context, in case it helps, but I'm not seeing anything that jumps out at me. I don't really know what to do. Any ideas?

debug: Loading module '\000/lua/ui/dialogs/keybindings.lua\000'
debug: Loading module '\000/lua/keymap/keydescriptions.lua\000'
debug: Loading module '\000/lua/keymap/properkeynames.lua\000'
debug: Loading module '\000/lua/keymap/keynames.lua\000'
debug: Loading module '\000/lua/keymap/keycategories.lua\000'
debug: Loading module '\000/units/urb1202/urb1202_script.lua\000'
debug: Loading module '\000/units/ura0107/ura0107_script.lua\000'
debug: Loading module '\000/units/ura0101/ura0101_script.lua\000'
debug: Loading module '\000/projectiles/cdfcannonmolecular01/cdfcannonmolecular01_script.lua\000'
debug: Loading module '\000/lua/cybranprojectiles.lua\000'
debug: Loading module '\000/effects/entities/debrismisc04/debrismisc04_script.lua\000'
debug: Loading module '\000/lua/genericdebris.lua\000'
debug: Loading module '\000/units/ura0102/ura0102_script.lua\000'
debug: Loading module '\000/lua/sim/tasks/enhancetask.lua\000'
debug: Loading module '\000/lua/sim/scripttask.lua\000'
debug: Loading module '\000/units/url0107/url0107_script.lua\000'
debug: Loading module '\000/projectiles/caaautocannon02/caaautocannon02_script.lua\000'
debug: Loading module '\000/effects/entities/debrismisc09/debrismisc09_script.lua\000'
debug: Loading module '\000/units/urb2101/urb2101_script.lua\000'
debug: Loading module '\000/projectiles/sinker/sinker_script.lua\000'
debug: Loading module '\000/projectiles/cdflaserlight01/cdflaserlight01_script.lua\000'
debug: Loading module '\000/projectiles/cdflaserheavy01/cdflaserheavy01_script.lua\000'
debug: Loading module '\000/units/urb2301/urb2301_script.lua\000'
debug: Loading module '\000/units/xra0105/xra0105_script.lua\000'
debug: Loading module '\000/units/urb3101/urb3101_script.lua\000'
debug: Loading module '\000/projectiles/cdflaserheavy02/cdflaserheavy02_script.lua\000'
debug: Loading module '\000/units/urb1201/urb1201_script.lua\000'
warning: c:\work\rts\main\code\src\libs\gpggal\DeviceD3D9.cpp(937) Device lost