sliding door lock mechanism with exterior key entry is failing to work properly.

This door is a main entry point and lately when locking the door outside by key or inside by latch it does not lock and requires 2-3 attempts to succesfully lock. The latch is loose meaning the small stick which goes up to lock or down to unlock is extremly wobbly and can be pushed more ways than just up and down. how can I fix this? Thanks.

I installed the mortise lock into the sliding glass door but now the hook does not catch the keeper unless you close the door, then roll it back open about 1/8" or 1/4". I know the screw above the hook is for adjustment of the hook which I have tried turning to the right and to the left but neither seems to make a noticeable difference. Is it possible the adjustment mechanism is faulty? I am still utilizing my old mortise lock because the one I purchased doesn't fit. It's slightly too big and my current one is not rectangular, but angled. Also my old one says Adams on it. How do I fix this?