@Joseph-TP Somehow,after your tech help through TeamViewer, today the LED display having display issue like the photo. And also I found that the BE800 just shutdown when I woke up this morning , got...

@Joseph-TP Ok thanks for helping. And I just noticed something, when I use the WiFI Tools package which development by TP-Link to test the ping, ipv6 packet loss are around 60-80% everytime.

@Joseph-TP Yes, I did set the WAN to Port 1 on setting page. Only modem >> BE800, nothing else between them. The modem model is I-040GW made by Alcatel-Lucent , and the ISP provider are Taiwan CHT...

@Joseph-TP Sorry , my mistake Should be port 1 and Port 3 , like the first pic

If I connect my ISP modem with 10gbs/SFP+ (Port 1) , and 10gbs (Port3) with my PC. it just causing the whole internet and WiFi ( 2.4g 5g 6g all of them) speed low and "really really really unstable",...