I did not have any lithium grease so after some googling I decided to try dry PTFE lube. Did not help. It still squeaks and now I also got a rattling lead screw. It starts to vibrate when I lower/raise the bed. Investigating further I noticed there is a bit of play in the lead screw nut. I can wiggle the screw in the nut on one side. This can not be normal? And my phone suddenly refuses to record video! Going to clean the screws and get some grease. But I'm thinking to get the screws replaced.