Why does the microphone boost option automatically deselect in Volume control properties?

Why does the microphone boost option automatically deselect in Volume control properties?

In the bottom right corner there is a volume icon, and clicking on it brings up the volume level control. I like to have it at maximum, as I use Skype. However, every now and then the volume resets itself to a default level of medium. Another problem is the Micrphone boost option in the recording properties of Volume ALSO resets itself. It’s very frustrating to reset it everytime, especially since I use Skype everyday, and if the microphone boost option isn’t selected, recipients on the other end don’t hear my voice. I have to use the embedded mic on my laptop.

Does anyone know why the volume levels/mic boost reset by themselves?