and the lock doesnt work anymore.

The locks to hold the legs in place do not work

The lock came lose.

A couple of months ago, I began to have issues with one of the legs no longer locking properly

In addition to the plastic locking tab that broke off early on (see below), the quick release plate that attaches to the camera body cracked, and was no longer fastening securely to the camera.

The locks all seem sturdy enough for every day use and are easily to adjust

The level works just fine, the legs extend and lock like you'd want them to, when you lock the legs, the locks aren't too stiff or too weak