Can't access to volume and got getcwd: No such file or directory

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hi
I have two sites on docker like below

Screenshot_2019-01-03_13-00-19
Screenshot_2019-01-03_13-00-19.png735×270 7.97 KB

and both of them has an own volume on Nginx container

 volumes:
      - ./site1/prod/static/:/var/www/site1/html
      - /home/my_user/docker/site2/wedding_card/priv/static:/var/www/site2/html

my problem is that after many hours one of the volumes inside Nginx container disconnected and static files not loaded

even I run this command

sudo docker exec -it nginx_master ash
cd /var/www/site1/html
ash: getcwd: No such file or directory
(unknown)

but cant access
after a restart, Nginx container problem is gone

I did search on google and find this

why I did get this problem?