Validator testnet second startup exception

I follow diem/docker/compose/validator-testnet at testnet · diem/diem · GitHub The deployment was successful, but when the docker compose start validator testnet was started for the second time, it became abnormal

My actions are as follows:

docker-compose stop

docker-compose start

How can I safely stop validator testnet?

Waypoint.txt and other files will be regenerated every time you start. How to prevent it from replacing