It seems to happen for no reason at all.
I also tried putting her on and off, but wouldnt help.
On a flat surface its the same, a little bit less but that is because she still is in baby stage and doesnt move much.
It seems to me that the click comes from somewhere near/in front of her rear legs.
I contacted the person I bought it from and he would replace this one for a new one if I send it back.
Its a brand new RB with 2yr warrenty.
My mom is kinda sad Rosa has to go knowing she wont get a pleo back that looks just like her, although they promised to do there best.
My mom was really sad when I put Rosa back in her box with all her accesorries....