I have the same problem with an NX200 V1. It works correctly on 4G (LTE), but when switched to 5G (5G NR), it starts dropping packets and experiencing ping times of up to a second at times. I haven't been able to test it on a true 5G SA network, but the problems are definitely noticeable on 5G NR. Perhaps it would be a good idea to make the 5G/4G/3G option only include true 5G SA.

  @David-TP 

These are the two configurations. When I'm on 4G (LTE) it works correctly, but when I'm on 5G (NR5G) it's when I have problems. See the attachments.

4G (LTE)

5g (NR5G)

  @David-TP 

i have an archer nx200 v2.0 with firmware version: 1.0.0 3.0.0 v60e0.0 Build 240822 Rel.76438n

i got a notification to upgrade to 1.2.0 3.0.0 v60e0.0 Build 250725 Rel.73467n

Is there a specific reason i should upgrade? 

ChatGPT mentions issues after updating: 

1) Connection Instability / Drops
Several users on the official TP-Link community forums are reporting that after updating to the 1.2.0 firmware, their Archer NX200 stopped working reliably — the internet connection drops frequently, and the router’s admin status page shows messages like “Please configure DNS manually.”

2) Need for Manual Band Fixes
One user said that after the update, the connection became unstable with automatic band selection enabled. They resolved it (partially) by manually fixing the 4G/5G bands — but still noticed minor stability issues they didn’t have before.

3) Intermittent Internet and Slow Web UI
Another forum report from a different user also describes intermittent internet even after the firmware upgrade, and slower than expected access to the router’s management page — despite being wired directly to the device.

i know it may be wrong, however it gave me second thoughts... i mean it works fine as it is... 

Moreover i cant find the release notes anywhere.... 

thank you in advance