Aap sabse pehle jaldi se ek WD-40 spray kharidke unn sab buttons pe use karo. Matlab button k side me thoda gap hota hai wahan par spray karna jab speaker bandh ho. Use 2 ghante tak rehne dena uske pehle speaker on mat karna lekin aap spray k baad buttons ko dabana multiple times. Isse sahi ho jana chahiye kyuki muje same issue tha aur mene yahi kia hai.