I'm using Marlin. Recently my Z-probing randomly doesn't work. Sometimes during Z-Homing it goes up instead of going down to sense the Bed! In Bed Leveling it goes higher and higher every time. It got frustrating so I ignored Bed-leveling.
Sometimes I get a fine Z-homing but it always starts printing in the air!!! I have no Idea why it happens. All home and axis offsets and setting are fine. I had no problem last time I used my printer. Why my printer starts printing 5 mm in the air?