some questions about reinforcement learning with carla

I just want to konw what is the network architeture in you A3C experiment ? And what is the image size used ? 
I try to output 320 * 240 image with 3 instances on one GPU,  but the TCP connection is always broken. I guess it's because of the amount of data ? And how can I solve it ?

Currently I only use image 84 * 84, which I think it's too small .