My Speakers making noises help

Alright, I need help from experts I'm sure you guys are reading this lol. Well my 2 rear speakers are fine. But my two front one one of them is infected or something, sometimes when I'm listening it'll produce weird tapping noises, and would not perform to it's full quality sometimes it would just stop working and work again in like 2 seconds, it's weird. Thanks all In Advance If you guys know what the problem is.