Neat. Could be a cerebellar thing. Taking it to the vet may be a good idea just to rule out other causes that can be identified (vs idiopathic which is basically a fancy word for 'we don't know why that happens yet'. Bit more to it but that's the gist).
Cleverly disguised as a responsible adult.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, throughly used up, totally worn out, and loudly proclaiming --- 'WOW, WHAT A RIDE!!!!' " - Author Unknown