LumenRT U13 - Drive through skips ahead

Hello,

I create the traffic in CONNECT U13 and exported to LumeRT. In LumenRT I create a new movie clip set my time to be 40sec and attach a camera to a car.
When I play the animation everything is fine up to 24 seconds then it skips ahead about 10sec. I cannot get the drive through to cover the entire path, it seems to loop\skip at certain points.

Any thoughs appreciated,

Thanks

Tom F.