My volume toggle button on the side does not work

[sumerstellargaze]

One day my toggle button on the side that turns up and down the ringtone volume, it also controls my speaker volume, stopped working. The decrease volume works, but the increase does not. I can raise and lower the ring tone sound by the menu, but there is no way to raise the sound up on the speakers when I am talking on the phone. So lets say I accidentally I turned town the volume while talking to someone I would be unable to raise it back up because there is now way to turn it back up through menus. Can anyone help?

Its a V3m