https://developers.weixin.qq.com/miniprogram/dev/platform-capabilities/industry/express-download.html

开启自动打印，时间一长就显示网络连接失败。

程序日志显示不停重试，退出软件再进又好了。

[2022-05-16 13:33:07][CRITICAL] POST FAILED RETRY QNetworkReply::NetworkError(UnknownNetworkError)