Zyxel FWA510 Stability Issues

dann3s99

Hi everyone,

​I am looking for some help with my Zyxel FWA510 (running the latest firmware). I am using it with a Telia SIM card in Sweden.

​The Problem:

My connection is very unstable. The router frequently drops the internet connection. When it stops working, the "Globe" LED changes from Blue (5G) to Green (4G), but even though it shows a green light, there is no internet access at all. The only way to get it back online is a manual reboot.

​What I have tried so far:

• ​I tried locking the bands to NR5G-NSA and selecting specific bands (n28 and n78) to prevent "jumping" between 4G and 5G.
• ​I have configured the APN manually to online.telia.se with PDP type IPv4 (and also tried IPv4/IPv6).
• ​I have tried reverting settings to "Auto Selection," but the issue persists. The router seems to "freeze" or lose data routing during the handover between 5G and 4G.

​My Goal:

I want to achieve a stable connection where the router doesn't "freeze" when the signal fluctuates. I would prefer to stay on 5G, but most importantly, I need the internet to stay alive without requiring a daily reboot.

​Specific questions:

1. ​Is this a known bug in the latest firmware regarding the 5G/4G handover?
2. ​Are there specific LTE "anchor bands" for Telia Sweden I should lock/unlock to make the NSA connection more stable?
3. ​Should I disable "Network Monitoring" or any other specific setting to prevent these freezes?

​Any advice or stable configuration profiles for Telia would be greatly appreciated!

Zyxel_Tina

Hi @dann3s99,

Welcome to the Zyxel Community!

To investigate further, could you please provide the cellular information when the issue occurs? Screenshots are very welcome.

Please note, if the signal is weak or fluctuating:

• Try relocating the router to a more open or elevated position.
• Avoid placing it near metal objects, thick walls, large appliances, etc., to reduce interference.
• Point the antennas toward the nearest base station.

You may also refer to the following FAQs for signal and antenna optimization:

• What Steps Should I Follow to Improve 5G Signal Reception for FWA505? — Zyxel Community
• How to improve cellular WAN signal strength with external antenna? — Zyxel Community

Additionally, if the device is registered in Nebula, please enable Zyxel Support Access and share your organization/site name, so we can review the device status directly.