BSOD 0x9f when computer enters sleep mode

Hey everyone,

I've had this Dell Studio 17 laptop for a few years now, and have ran into a few problems in the past. However, in the past few weeks, the computer seems to blue screen almost every time I close the lid and it enters sleep mode. This has not happened at all while the computer itself has been running.

Here is the minidump file from this morning. All of the 8-10 minidumps since 12/11 seem to point to "ntkrnlmp.exe", if I'm reading that correctly. What do you guys think is the problem?

Thanks.

DRIVER_POWER_STATE_FAILURE (9f)
A driver has failed to complete a power IRP within a specific time (usually 10 minutes).
Arguments:
Arg1: 0000000000000004, The power transition timed out waiting to synchronize with the Pnp
subsystem.
Arg2: 0000000000000258, Timeout in seconds.
Arg3: fffffa8003d57b50, The thread currently holding on to the Pnp lock.
Arg4: fffff80000b9c510, nt!TRIAGE_9F_PNP on Win7

Debugging Details:
------------------

Implicit thread is now fffffa80`03d57b50

DRVPOWERSTATE_SUBCODE: 4

FAULTING_THREAD: fffffa8003d57b50

CUSTOMER_CRASH_COUNT: 1

DEFAULT_BUCKET_ID: WIN7_DRIVER_FAULT

BUGCHECK_STR: 0x9F

PROCESS_NAME: System

CURRENT_IRQL: 2

LAST_CONTROL_TRANSFER: from fffff80003289a32 to fffff80003296e7a

STACK_TEXT:
fffff880`0335b740 fffff800`03289a32 : fffffa80`03d57b50 fffffa80`03d57b50 00000000`00000000 00000000`0000000d : nt!KiSwapContext+0x7a
fffff880`0335b880 fffff800`032964da : fffff880`0335b900 fffff800`034fec38 00000000`00000000 00000000`00000000 : nt!KiCommitThreadWait+0x1d2
fffff880`0335b910 fffff800`034f9ff4 : fffff8a0`00000003 fffff880`0335bc28 60008fb0`00000001 fffffa80`00000000 : nt!KeWaitForMultipleObjects+0x272
fffff880`0335bbd0 fffff800`035f45bc : 00000000`00000000 fffffa80`03ca9e00 fffff8a0`0ee317b0 00000000`00000000 : nt!PnpNotifyUserMode+0x158
fffff880`0335bc50 fffff800`0329d641 : fffff800`034f9768 fffff8a0`0ee317b0 fffff800`034312d8 fffff800`034406c0 : nt! ?? ::NNGAKEGL::`string'+0x5ab89
fffff880`0335bcb0 fffff800`0352ae5a : 2caf3450`9d428ce7 fffffa80`03d57b50 00000000`00000080 fffffa80`03ceb9e0 : nt!ExpWorkerThread+0x111
fffff880`0335bd40 fffff800`03284d26 : fffff880`03167180 fffffa80`03d57b50 fffff880`031720c0 c161e361`da1c81e2 : nt!PspSystemThreadStartup+0x5a
fffff880`0335bd80 00000000`00000000 : fffff880`0335c000 fffff880`03356000 fffff880`0335b9e0 00000000`00000000 : nt!KiStartSystemThread+0x16


STACK_COMMAND: .thread 0xfffffa8003d57b50 ; kb

FOLLOWUP_IP:
nt!KiSwapContext+7a
fffff800`03296e7a 488d8c2400010000 lea rcx,[rsp+100h]

SYMBOL_STACK_INDEX: 0

SYMBOL_NAME: nt!KiSwapContext+7a

FOLLOWUP_NAME: MachineOwner

MODULE_NAME: nt

IMAGE_NAME: ntkrnlmp.exe

DEBUG_FLR_IMAGE_TIMESTAMP: 503f82be

FAILURE_BUCKET_ID: X64_0x9F_4_nt!KiSwapContext+7a

BUCKET_ID: X64_0x9F_4_nt!KiSwapContext+7a

Followup: MachineOwner

I may have found a solution. It may have to do with the fact that my computer is hosting a bluetooth network, and my iPhone may be trying to connect while the laptop is in sleep mode. I'm not sure if this is the case, but I will post if I've found any results.