Without knowing anything about the specific structure of your comp nobody can tell you much. Checkout errors typically point to cyclic references that cause invalid loops, e.g. layers referenced in effects pop-ups where the layer itself is generated/ used with some otehr effect or in a pre-comp. You have to be very, very specific down to the T to unriddle this.
I'm not sure where you're coming from.
Sorry Can you explain?
It stops at the same point in time when you render? What layer or effect starts up at that time?