rendering problem

Además de las sugerencias de ShiveringCactus y Mylenium, asegúrate de no estar exportando a un directorio de una nube como iCloud, Dropbox, OneDrive, G-Drive, incluso el mismo Creative Cloud, etc. Si es así, intenta primero exportar a un directorio en el disco de almacenamiento de tu computador y luego lo subes a la nube. 

Without exact system info, render settings and critical details like actual save locations nobody can tel lyou much. As the cactus already said, this could be network errors, but then again it could just as well be local issues on your machine like caches getting full or another process/ app interfering with rendering. Impossible to deduce anything based on what amounts to effectively zeror information on your part. You need to be much more specific and provide some details.

Mylenium

That sounds to me like you might be using files across a network.  Sometimes if the network drops out, AME can no longer render.  Can you check to see if all files are local?