I am currently using two TP-Link routers: Archer C6 and AX12, on the same ISP connection for comparison.

The Archer C6 is running the latest stable firmware (v1.1.1), and it works perfectly without any issues. However, I am facing multiple problems with the AX12 firmware.

Previously, on firmware version 1.2.1, the AX12 had frequent disconnection issues. To resolve this, I updated to the 1.2.2 beta firmware. While the disconnection issue seems improved, new problems have appeared.

Now, during WhatsApp video calls, the quality drops randomly along with lags and jitters, even though there are no issues with download or upload speeds when tested separately. Additionally, VoWiFi (Wi-Fi calling) drops randomly on the AX12, whereas it remains stable and consistent on the Archer C6 under the same conditions. I've also reset the Ax12 but there is no improvement.

Since both routers are using the same ISP and environment, this does not appear to be an internet issue, but rather something related to the AX12 firmware.

Please look into these issues and provide a stable firmware update. Thank you.