Having been on the chipping course ......
no, its a combination of the fact that the newer ones have a rough surface so the body scabs around and holds it in place..
and where they are implanted, They are supposed to be implanted in the moddle of the shoulder blades but if for whatever reason the implant goes to one side then there is a gravity effect that can draw the chip down.
So if kitty is implanted correctly then sleeps a lot
Would recommend checkng every so often and if it has move re chipping - cos if your vet has problems finding it so will anyone else.