使用yarn install 命令時，偶爾出現此錯誤：There appears to be trouble with your network connection. Retrying...
可以透過以下步驟解決（親測OK）
1、刪除https-proxy、proxy
yarn config delete https-proxy
yarn config delete proxy
2、刪除成功後，則重新設定https-proxy、proxy
yarn config get https-proxy yarn config get proxy
3、在專案中重新使用yarn install命令