I work in a dialysis unit and the loss of voice during the end of treatment and for a time afterwards has been reported to me by quite a few patients of mine over the years. The doctors always say its nothing to worry about.
I read that adrenal problems can so since your kidneys are not working and you are on dialysis, not to mention I am not sure but does this cause you to have dry mouth at all...then I would think that it is possible. HUGS and Peace to you and yours