yarn is having troubles with the network connection

Try clearing your cache

$ yarn cache clean
$ yarn // to install dependencies, no need for "yarn install"

Approach 2

$ yarn install --network-timeout 1000000

Reference https://github.com/yarnpkg/yarn/issues/4890#issuecomment-358179301

Try increasing network timeout

yarn install --network-timeout 1000000

found this on GitHub issues https://github.com/yarnpkg/yarn/issues/4890

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