**UPDATE: I contacted the seller and they were very responsive and helpful. They think the foil is defective, so they send me a new one. Rating changed from 3 to 5 for excellent customer service! I bought them in 2 different sizes and encountered the same problem. Sometimes they close. Sometimes they don't and just get stuck in the "pop out" position. I thought I might have pulled the drawers all the way out, so the problem was resetting the mechanism, but that doesn't always work either. This also happens when there is nothing in the boxes, so it has nothing to do with the weight. Both my husband and I have experience with this type of job and have installed many drawer slides so I don't think it was an installation issue as they were positioned and aligned correctly. It's a shame as they feel like they're practicing slides and sliding well but can't hold them if the slide mechanism isn't working consistently.