1.please change other eternet cable ,Please change other router
2.please try to use static IP
3.Ethernet usage frequency (24h always connected?) Is the poe version
4.Can you exchange the whole bottom shell to confirm whether it is a wiring problem
5.Is it possible to connect to a PC using adb command to capture logs?if not ,please download the app to install to device and run it to get log ,after that please get the log file from root folder .The steps are follow :
(1) open apk (2)click catch log (3)reproduce issue such as reconnect eternet cable (4)get the log file
T20logtool_sign.apk:
http://service.telpo.net:8091/index/user/fetfile?key=LVROe6w3X7JqudCy