Speaker PLEASE HELP!

I am having problem with my speak,the vloume of music is dfferenot.The laundness of the music is diiferent,it become very soft when I pause the music and turn it back again. It come back to normal when I drag the time Line of the music,it also happen on apps like YouTube,after is being pause by anything the volume become very soft when I turn it back.PLS HELP!