You may have a condition called subluxation or dislocation of your tendons. This occurs when you make quick cutting motions or walk down stairs. A subluxation is when your tendons jump out of their normal position and than move back. A dislocation is when these tendons move out and you may have to actually push them back into place. You may also experience pain, and instability of your ankle. Some people with chronic ankle sprains complain of popping in their ankles. I recommend using an ankle support. I use them whenever I feel like walking barefoot at my house. You can also wear them under your sock.