@Kevin_Z Thanks for your reply I have change wifi card for laptop to another model, which support 5GHz wifi network. And it works fine. Problem was in T2U Nano adapter.

@Kevin_Z Thanks for your reply. I will contact my the retailer for change adapter to another. Several words about hidden networks. They can be detected by T2U Nano (2.4GHz and 5GHz) and laptop...

@Kevin_Z Install driver for T2U Nano from your link - v1030.29.1102.2017 dd 18.07.2018 (TP-Link Technologies Co., Ltd.). Bandwidth from internet operator is 100 Mbps download/upload. From laptop with...

Thanks for you reply. @Kevin_Z Link with driver is not work: "file does not exist"

@Kevin_Z Thanks for your reply. "For the speed issue of 2.4GHz, do the 2 laptops have the same issue?" - Have problem on 2 laptops only on 5GHz network "With them connected to the 2.4GHz of the Deco...

@Daveomania I have similar problem with Deco E4. My forum thread is https://community.tp-link.com/en/home/forum/topic/173196