Mid/rear Seats Assembly problems of the 2000 Chrysler Town & Country

We own a 2000 Chrysler town and country limited minivan. The middle row of seats are removable. From time to time, we remove and reinstall the seats per the directions in the manual. After each time we reinstall the seat, we ensure that the seat is secure by making sure it can't disengage. Despite this, the middle seats periodically disengages spontaneously, pops out, and tips forward or backward with our child in it. When this happens, we stop the car, pull over, and put the kid in a different seat. Then we reinstall the seat when we are at safer spot. We test again to make sure the installation is secure and continue driving. Then, a few weeks or months later, the seat pops out again. The most recent such incident is dated below.