This is mean that the disk has a great latency and prevent the filewalker to finish its work.
You may try to disable the lazy filewalker to allow it to run with a normal priority
pieces.enable-lazy-filewalker: false
save the config and restart the node. You may also use it as an argument after the image name in your docker run command:
docker run -d ...
...
storjlabs/storagenode:latest \
--pieces.enable-lazy-filewalker="false"