win 服务器下 nginx 网站突然打开很慢很慢

phpstudy下面nginx启动的一个网站，今天突然打开非常慢，有时候直接报nginx的错误页面，errorlog基本都是这个

2020/01/13 14:09:56 [error] 3768#2720: *1561 WSARecv() failed (10054: An existing connection was forcibly closed by the remote host) while reading response header from upstream, client: 58.216.217.70, server: localhost

尝试重启nginx还有换成Apache，网站打开还是非常慢，任务管理器cpu和内存都很正常，咋回事呢。。。