scrolling down enguogh causes a wired sound as of trying to enter world sound glitch

while i was looking for my first ever world atleast after alittile bit of scrolling i found my first problem i seee the wolrds all so 21.0 MB of ram then this 2nd one was the one i am telling the mods i hear allot of of the sound when your entering a world i didnt enter the words the sound just spamed it self then i pressed the home buttion for about 1 second the sound kept playing fore the first half of the second then the other half of it the sound froze then it stoped