sound slide problem after using alarm

hi(sorry for my bad english)
i have a problem in my iphone 4s
after i using my alarm, i want to slide to stop it, when i slide it, its sqeeky sound like it try to make a sound, but it suddley stop...its only happening in my alarm..
i tried to restore the iphone, open\close, make hard reset but the problem has not been disappered, anyone have idea?

 

its only happening in alarm
to fix the speaker?