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It seems that the crashes are caused by 1 of the Nvidia drivers.
Fortunately this driver is updated
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
So there may be another driver from the GPU causing this.
7: kd> lmvm nvlddmkmstart end module name
fffff880`0588c000 fffff880`06365000 nvlddmkm T (no symbols)
Loaded symbol image file: nvlddmkm.sys
Image path: \SystemRoot\system32\DRIVERS\nvlddmkm.sys
Image name: nvlddmkm.sys
Timestamp: Fri Aug 07 05:22:42 2015 (55C42482)
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4
Please try the solution described in this thread of Nvidia as it could solve your problem.