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Docker Playground Error after BuildX

When i run OpenSpeedTest Docker image in Docker Playground i am getting


Results failed GET request.

Commands i used

docker run --restart=unless-stopped --name=openspeedtest -d -p 80:8080 openspeedtest/latest

Recently i used buildX

docker buildx build -t openspeedtest/latest:speedtest --platform linux/amd64,linux/arm64,linux/ppc64le,linux/s390x,linux/386,linux/arm/v7 . --push

When i run locally it is working fine.
Why it is behaving differently on some machines ?
I am doing something wrong here?

Added buildx binary manually - worth noting I couldn’t use buildx simply by specifying export DOCKER_CLI_EXPERIMENTAL=enabled.
Arch Linux
Docker version 19.03.5-ce, build 633a0ea838

failed to solve: rpc error: code = Unknown desc = failed to solve with frontend dockerfile.v0: failed to build LLB: failed to load cache key: failed to do request: Head dial tcp: lookup on read udp> i/o timeout

How to solve this issue.