Unless you glued them when assembling, moving most IKEA furniture fully assembled puts a lot of stress on the hardware and it permanently loosens up.
but protip: glue your ikea furniture when you assemble it. a little wood glue on the joints makes it 10x sturdier.
Depending on the piece they may not survive the structural stresses, especially the lower end models.
I've never had a piece of ikea equipment where that applies, I'm typing this on my ikea desk from 2011, next to a 2x2 kallax and another 2x4 kallax that have moved 5 and 3 times respectively.
Well, kallax 2x4 is still a rather light piece of furniture and there's not much need to disassemble it. This need grows with size/weight - e.g. couches, large wardrobes (Pax) etc.
OTOH, I have a 4x4 Kallax that's barely been moved between the rooms couple times in the last few years, and it's already getting wobbly enough that I'm afraid to put much weight on it; it's another of my IKEA furniture pieces that'll end up reinforced with metal angle brackets.
Sometimes they just don't fit elevators / stairs :)