Pihole “DNS Service Not running” and “FTL offline” after v5 installation

Expected Behaviour:

I'm running Pihole in a docker container from the official DockerHub image tag:latest.
Deployed on a raspberry pi clone : NanoPi Neo.

Actual Behaviour:

Pihole does work but will indicate that DNS service is not running and FTL is offline almost constantly. It's on for half a minute and goes off again.
Been running Pihole this way for a very long time already, it's only the upgrade to v5 that makes it unstable to use.
Since my hardware has not changed, is there anything I need to take into account before switching to v5?

Debug Token:

Sorry because it was so unstable I reverted to docker image v4.4. This is again running flawlessly.

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