I have a Kwikset TITAN on the front door of my home that is about 4 years old. It is a "sectional handleset with single cylinder deadbolt." Over time, the lower part of the handleset (not the deadbolt) has become loose, allowing the interior and exterior handles to slide left and right about 1/8 to 1/4 inch, with the latch mechanism moving accordingly in its channel. The latch mechanism is not held in place with screws -- it looks like the kind that is tapped into place.
The result of all this is that when closing the door, the latch mechanism often slides far enough out of its channel to strike the doorframe, preventing the door from closing (and denting the doorframe too).
I have tried tapping the latch mechanism back into the door, but it never stays. I have tried tightening the screws on the interior handle, but they are already very tight.
Any ideas how to solve this problem? Is it a problem with the lockset, the door, or the installation?
Thank you!