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I've looked at the last three of your crash dump files, 2 of which refer to memory corruption, this does not in itself mean that your memory is bad but it would be worth checking it using Memtest86+. This can take a long time to complete 8 passes; possibly a full day for your 16GB.
One file had a reference to a driver error:
This would suggest it is worth ensuring the NVidia drivers are up to date or try to reinstall them. If you do this, uninstall everything and just load back the driver file only by selecting custom install.
ffffd000`22ffa358 fffff800`87f3f995Unable to load image \SystemRoot\system32\DRIVERS\nvlddmkm.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys