This seems to be a recurring issue as of late. Several post recently with this same issue. Our 2016 33IK had same problem. I would recommend you check to make sure the slide out floor is not water damaged along the exterior edge, right below the metal drip edge that runs along the bottom of the slide. The black dacor material once used and scuffed is allowing water to soak thru and this causes the floor to weaken. While doing repairs to our floor I discovered that, (believe it or not) the only thing holding the slide walls to the floor were those small #10 screws that went thru the metal drip edge. I ran 2 inch self tapping flat head screws up from the bottom into the aluminum slide wall bottom frame on both of our slides. I then sealed the heads with caulk. To complete the repair I installed what Forest River calls slide skies. They are plastic and go up under the fiberglass edge and extend under the floor, this serves as a waterproof drip edge and stops the dacor water issue.
Really hope your problem is just broken screws. Good luck. Please let us know how you make out.