Crash in wdmaud.drv module ( Win 7 64 bit Service Pack 1) [Solved]

Crash in wdmaud.drv module ( Win 7 64 bit Service Pack 1)

I support IP softphone which uses winmmAPI.
Very intermittemtly our application reports crash in wdmaud.drv module.
Problem signature:
  Problem Event Name:        
APPCRASH
  Application Name:
i2050.exe
  Application Version:            
4.0.4.132
  Application Timestamp:     
52fdc18c
  Fault Module Name:           
wdmaud.drv
  Fault Module Version:        
6.1.7601.17514
  Fault Module Timestamp: 
4ce7ba26
  Exception Code:    
c0000005
  Exception Offset:  
00004dc9
  OS Version:             
6.1.7601.2.1.0.256.4
  Locale ID:   1033
  Additional Information 1:  
0a9e
  Additional Information 2:  
0a9e372d3b4ad19135b953a78882e789
  Additional Information 3:  
0a9e
  Additional Information 4:  
0a9e372d3b4ad19135b953a78882e789
Collected dumps show that in most cases the crash occurs in
    wdmaud.drv!CWorker::_DoRecurringJobs()  + 0x5e bytes  
(or _DoRecurringJobs()  + 0x63 bytes)
    wdmaud.drv!CWorker::_ThreadProc()  + 0x265 bytes    
    wdmaud.drv!CWorker::_StaticThreadProc()  + 0x2e bytes           

Since the issue occurs very intermittently it is unclear which actions from our application side can cause the crash.
Sometimes it happens when the phone starts to work with audio, sometimes when finishes.
 
The issue occurs on Win 7 64 bit Service Pack 1.
I surfed the internet thoroughly but didn’t find any clue so would appreciate any ideas.

Anwsers to the Problem Crash in wdmaud.drv module ( Win 7 64 bit Service Pack 1)

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