This sounds like your GPU might be overheating after playing for a while.
Please log your GPU and CPU status while playing until it crashes again.
Logging your CPU and GPU Temperatures
CPU: Download Core Temp
. Start it and activate logging in the menu under "Tools/Logging on".
The log file created is called similar to "CT-Log [TIME][DATE].csv".
GPU: Download GPU-Z
Start it, select the "sensors" tab, and activate "Log to File" at the bottom of the window.
Choose a location for the log file.
Run the game until it crashes.
Zip the files
and attach them to a reply in this thread.