Clicking of auto lock without prompting

Today when I got into my Camry, the auto lock clicked several times without me hitting the button on my car remote. I didn't think much of it, until the same noise clicks several times in a row while I was driving. The locks didn't actually change position, but there was a stream of clicking as if the locks were locking and unlocking. At one point I tried to hit the unlock button on the door - the one that unlocks the whole care - and it locked, then sprang to unlock.