I loose my voice usually when I am on the phone. I find myself talking but no sound comes out. The harder I try the worse it seems to get. Asfor the muscles, at times they seem to do little dances. My oldest gran daughter first commented when she was 6 yrs old. I had a long sleeve T Shirt on and she insisted that I had a mouse up my sleeve and it was running from arm to arm. Another thing that happens to me is sometimes I forget basic things like names etc. It usually last for a couple of minutes. ( The doctor tells me its MG related).