Thanks for the reply! After taking some time to understand the performance of the rma set. I think the 5ghz is still being quite unstable. I have the 5ghz network being dropped intermittently. For example, the phone will just drop the 5ghz network and go searching and scanning for network within the vicinity. It does not only happen to one phone. I have got numerous different models of phone to connect onto 5Ghz to see what results I have got from the various models (xiaomi, apple, samsung, sony, asus, huawei)
All of the following brands are having the same problem to an extend, my question would be what should i do next given that I have already rma the set. Is it possible that the ISP has something to do with this instability? During the testing time frame, I am actually just near to the router. The router is being placed on top of my tv cabinet with no other obstructions near its path. Thanks for the advise again.