Originally Posted by
beeftech
a stiff link in the chain. (not much you can do about this)
.
My first thought was a stiff link too, and you can do something about that. You have to take the chain off, bend all of the links until you find the culprit/s (if any), then you can bend the chain back and forth laterally on the pin of the stiff link to loosen it up.
Otherwise it could be the classic "cog and lockring aren't tightened down properly".