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please provide the reproduece code

你的问题是什么？

“link is builded ERROR” that means ESP 8266 is under the connection. before you use "AT+CIPMUX=1", we recommad you disbale the ESP8266 connections

hi sir，
My steps for your reference, "AT+CIPMUX" works ok

will your device required the concurrence between AP and STA (ESP8266)?

Hi Sir: for AT+CIPMUX, something need your notification: 1. "AT+CIPMUX=1" can only be set when transparent transmission disabled( "AT+CIPMODE=0") 2. This mode can only be changed after all connections are disconnected. 3. If TCP server is started, has to delete TCP server first, ...

please highlight which router to reproduce the issue.
and also need clarify the settings of the router

你好，
system_deep_sleep参数设置有两种情况：
1）设置为0，此时内部不会有定时器，系统会一致处于deep-sleep状态，除非通过外部GPIO拉低RST来唤醒
2）设置为>0，这就是设置了定时时间，单位为us；理论上讲，和你说的是一致的

对于这样的exception问题，你可以参考附件的调试手册，看看问题在哪里