BSOD error after sleep mode

Windows 7 64bit build 7057
System has been setup for about 4 months now with no problems and there have been no hardware changes. A couple weeks ago I started seeing the BSOD errors when the machine came out of sleep mode, maybe once every few days, now it happens every time the machine goes into sleep mode. I have attached the mini-dump file from the error. Any help on what it may be causing this from the files attached ?

Thanks for any help !

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7057.
Locale ID: 1033

Additional information about the problem:
BCCode: 9f
BCP1: 0000000000000003
BCP3: FFFFFA80075C5050
BCP4: FFFFFA8007074810
OS Version: 6_1_7057
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:

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