Have you installed your container on the µSD card?
You may not have enough space in the internal flash.
Take a look to the disk space left (df -h).
If there is no space left, it might be due to the logs generated by Node-RED.
If this is the case, add the following option when creating your Node-RED container :
--log-opt max-size=10m --log-opt max-file=5
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