Hi Nikki, and thanks for your post and question - it's a good one! I know we've had conversations here in the past, and we're glad to see you continuing to participate here in the community.
Generally speaking, the disease, COPD, is not responsible for the loss of one's voice. There can be any number of medical conditions or circumstances alone, that may result in the (temporary) loss of one's voice.
However, if this is a condition that is occurring (as you say), on a regular basis, you may want to address this very real concern with your physician. If the condition has persisted for a lengthy period of time, or worsened even, you may also want to seek out a specialist, like an ENT (ear, nose & throat) doctor or, an allergist.
What do you think?
Leon (site moderator COPD.net)