Lightball UP22 not staying upright.
Solution:
Check that the two short duct hoses at bottom of cleaner are free and clear of debris. If these will not close or seal properly because of debris then the cleaner may not lock into upright position as magnetic assembly (see below) will not engage.
If hoses clear, then check magnet assembly (a magnet and a separate metal plate) which, when brought together in the upright position, holds the cleaner in the upright position. I found that the magnet is held within a clasp and on my vacuum at least the magnet had come free of the clasp and was stuck magnetically to the opposing metal plate. As a result the magnetic grip was relatively poor, not helped by the full travel being reduced by the depth of the magnet about 5-10mm.
To fix the loose magnet, place the magnet back between the clasp and squeeze the two arms of the clasp, at either end of the magnet, against the magnet using a pair of narrow-tipped pliers. Worked a treat.
NB: The above fix requires you to disassemble the ball of the UP22 using a Torx T10 screwdriver to get to the magnet. Disassembly is not too difficult if mechanically minded. Same fix would apply to UP24 too.