Mute for Windows sound goes on automatically

I have written a program where autible alerts are curtical to the functioning of the program, but find the sound shuts off by itself.  I use a Turtle USB sound card and a pair of $50 speakers which make the sound quality really good.  But after a few minutes the sound goes off and when I check the Windows volume control I see the mute is on.

Does anyone know how the mute can go on by itself?  If so, please tell me.  If I can not keep sound working, my program loses 95% of its value.

Also, can anyone tell me how to programatically (C#.NET) turn the mute off?  If I can not find the answer to stop it from being turned on, I would like to turn mute off before I try and play a sound.

newbiewebSr. Software EngineerAsked:
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Download the WaveLibMixer.dll file / WaveLibMixer froject from following and add it as a reference
and implement following code.

            Mixers mMixers = new Mixers();
            MixerLines lines;
            mMixers.Playback.DeviceId = 0;
            lines = mMixers.Playback.UserLines;
            MixerLine line = lines[0];
                line.Mute = false;

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