File Server loses all it's shares and becomes unavailable

We have problems with a Windows Server 2008 R2 File Server. At random the file server loses all it's shares and the homedrive and application shares are not available anymore. A reboot seems the only way to solve this, untill it happens again. Today we had another crash and we were able to create a manual dump of the Server service. I have used WinDBG to analyze the dump, but I'm not really confident what I can use from this dump. Here is a copy of the dump:

Microsoft (R) Windows Debugger Version 6.3.9600.16384 AMD64
Copyright (c) Microsoft Corporation. All rights reserved.


Loading Dump File [D:\NLHFDFS01\svchost.DMP]
User Mini Dump File with Full Memory: Only application data is available


************* Symbol Path validation summary **************
Response                         Time (ms)     Location
Deferred                                       http://msdl.microsoft.com/download/symbols
Symbol search path is: http://msdl.microsoft.com/download/symbols
Executable search path is: 
Windows 7 Version 7601 (Service Pack 1) MP (4 procs) Free x64
Product: Server, suite: Enterprise TerminalServer SingleUserTS
Machine Name:
Debug session time: Wed Apr 29 10:47:14.000 2015 (UTC + 2:00)
System Uptime: 31 days 21:18:36.690
Process Uptime: 31 days 21:18:33.000
................................................................
................................................................
.................
Loading unloaded module list
................................................................
ntdll!NtWaitForSingleObject+0xa:
00000000`77a705fa c3              ret
0:000> !analyze -v
*******************************************************************************
*                                                                            *
*                        Exception Analysis                                   *
*                                                                            *
*******************************************************************************

*** ERROR: Symbol file could not be found.  Defaulted to export symbols for wuaueng.dll - 
GetUrlPageData2 (WinHttp) failed: 12029.

FAULTING_IP: 
+1fcd4b0
00000000`00000000 ??              ???

EXCEPTION_RECORD:  ffffffffffffffff -- (.exr 0xffffffffffffffff)
ExceptionAddress: 0000000000000000
   ExceptionCode: 80000003 (Break instruction exception)
  ExceptionFlags: 00000000
NumberParameters: 0

CONTEXT:  0000000000000000 -- (.cxr 0x0;r)
rax=0000000077a1a000 rbx=0000000000000000 rcx=0000000000005a4d
rdx=0000000077920000 rsi=00000000ffffffff rdi=00000000000000c8
rip=0000000077a705fa rsp=00000000000af4c8 rbp=0000000000000000
 r8=00000000000000f8  r9=00000000000af178 r10=0000000000000000
r11=00000000779200f8 r12=0000000000000000 r13=00000000002de110
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei pl zr na po nc
cs=0033  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000246
ntdll!NtWaitForSingleObject+0xa:
00000000`77a705fa c3              ret

FAULTING_THREAD:  000000000000016c

DEFAULT_BUCKET_ID:  STATUS_BREAKPOINT

PROCESS_NAME:  svchost.exe

ERROR_CODE: (NTSTATUS) 0x80000003 - {EXCEPTION}  Breakpoint  A breakpoint has been reached.

EXCEPTION_CODE: (HRESULT) 0x80000003 (2147483651) - One or more arguments are invalid

NTGLOBALFLAG:  0

APPLICATION_VERIFIER_FLAGS:  0

APP:  svchost.exe

ANALYSIS_VERSION: 6.3.9600.16384 (debuggers(dbg).130821-1623) amd64fre

PRIMARY_PROBLEM_CLASS:  STATUS_BREAKPOINT

BUGCHECK_STR:  APPLICATION_FAULT_STATUS_BREAKPOINT

LAST_CONTROL_TRANSFER:  from 000007fefdc210dc to 0000000077a705fa

STACK_TEXT:  
00000000`000af4c8 000007fe`fdc210dc : 00000000`02fa08c0 00000000`77a41da8 00000000`a4378ba8 00000000`01c9e060 : ntdll!NtWaitForSingleObject+0xa
00000000`000af4d0 000007fe`ffbdaffb : 00000000`ffffffff 000007fe`ffbd344c 00000000`00000000 00000000`000000c8 : KERNELBASE!WaitForSingleObjectEx+0x79
00000000`000af570 000007fe`ffbd9d61 : 00000000`002f6a70 00000000`000000c8 00000000`00000000 00000000`00000000 : sechost!ScSendResponseReceiveControls+0x13b
00000000`000af660 000007fe`ffbd9c16 : 00000000`000af7c8 00000000`00000000 00000000`00000000 00000000`00000000 : sechost!ScDispatcherLoop+0x121
00000000`000af770 00000000`ff251c09 : 00000000`00000003 00000000`002de110 00000000`00000020 00000000`00000000 : sechost!StartServiceCtrlDispatcherW+0x14e
00000000`000af7c0 00000000`ff25242e : 00000000`00000000 00000000`ff252329 01d0694a`57cae81a 00000000`2117ef12 : svchost!wmain+0x18a
00000000`000af7f0 00000000`778159ed : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : svchost!ScCreateWellKnownSids+0x2fd
00000000`000af830 00000000`77a4ba01 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : kernel32!BaseThreadInitThunk+0xd
00000000`000af860 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : ntdll!RtlUserThreadStart+0x1d


STACK_COMMAND:  ~0s; .ecxr ; kb

FOLLOWUP_IP: 
sechost!ScSendResponseReceiveControls+13b
000007fe`ffbdaffb 85c0            test    eax,eax

SYMBOL_STACK_INDEX:  2

SYMBOL_NAME:  sechost!ScSendResponseReceiveControls+13b

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: sechost

IMAGE_NAME:  sechost.dll

DEBUG_FLR_IMAGE_TIMESTAMP:  4a5be05e

FAILURE_BUCKET_ID:  STATUS_BREAKPOINT_80000003_sechost.dll!ScSendResponseReceiveControls

BUCKET_ID:  X64_APPLICATION_FAULT_STATUS_BREAKPOINT_sechost!ScSendResponseReceiveControls+13b

ANALYSIS_SOURCE:  UM

FAILURE_ID_HASH_STRING:  um:status_breakpoint_80000003_sechost.dll!scsendresponsereceivecontrols

FAILURE_ID_HASH:  {bb63494f-e1c6-d49e-12fa-866691bbfd47}

Followup: MachineOwner
---------

Can anyone help on this?