Audiodg.exe is causing speakers’ sound malfunctioning

While listening to anything on my laptop or playing games, the sound from the speakers’ just stops randomly

To get it back to work, I either:
- Kill audiodg.exe process
- Disable and re-enable speakers from the list of playback devices
- Restart Computer

What I have already done trying to resolve the problem:
- Uninstall/Re-install Sound Drivers
- Check for Updates for sound drivers
- Perform a Full System Scan with both Avast Internet Security and MalwareBytes PRO
- Replace my audiodg.exe file from another PC’s
- Full Scan with DllSuite for dll problems
- sfc /scannow

Additional informations:
- this never happens while using plugged-in headphones, meaning the sound never stops randomly
- The higher volume the quicker the sound stops.

System Tech's :
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Ultimate, Service Pack 1, 64 bit
Processor: Intel(R) Core(TM) i5-2430M CPU @ 2.40GHz, Intel64 Family 6 Model 42 Stepping 7
Processor Count: 4
RAM: 6125 Mb
Graphics Card: NVIDIA GeForce GT 525M, -2048 Mb
Hard Drives: C: Total - 356972 MB, Free - 109675 MB; D: Total - 358029 MB, Free - 256804 MB;
Motherboard: Intel Corp., Base Board Product Name
Antivirus: avast! Internet Security, Updated and Enabled