I have been using the Halo Flex for about 2 months. Over the past month I noticed my baby would wind up stuck, on her side, with her face pressed against the mesh lining on the end opposite the feet/legs. I checked the bassinet and realized it was NOT level. The side that is not supported by the legs/feet is lower and therefore the bassinet slants downwards, causing the baby to roll and get stuck at one end. Yesterday she rolled completely over onto her face on that side of the bassinet. She was swaddled (and cannot roll over on her own) so you can imagine I was extremely concerned. She is only 10 lbs and under the weight limit of 20 (& the rolling has been occurring for a few weeks - so she weighed even less when this started) and I do not lean on that side to remove my baby - so we are not putting excessive strain on that end to encourage slanting. It is possible I’ve received a defective one, but have read other reviews where this has been an issue.