Severe Network Lag After Updating to FWA510 V1.18(ACGD.5)C0 – Router Mode Unusable


Dear Zyxel Support Team,
I am using the Zyxel FWA510 as a wireless router. After updating the firmware to V1.18(ACGD.5)C0, I encountered severe network lag and significant performance degradation.
Issue Description:
- After upgrading to V1.18(ACGD.5)C0, the network became extremely unstable.
- Web browsing, video streaming, and even basic internet usage suffered from noticeable delays and frequent disconnections.
- The network lag was so severe that the device became almost unusable.
- Downgrading back to V1.15(ACGD.3)C0 immediately restored stable and smooth network performance.
Maintenance History:
- Previously, I encountered a similar issue with my original FWA510 device and sent it for warranty service.
- Zyxel replaced it with another unit running firmware V1.15(ACGD.3)C0.
- The replacement device worked perfectly under V1.15 without any issues.
- However, after manually upgrading the replacement unit to V1.18(ACGD.5)C0, the same network lag problem reappeared.
Analysis:Based on these experiences, I strongly suspect that the issue stems from the firmware version V1.18(ACGD.5)C0, rather than any hardware defect.
Consistent behavior across different devices after the update points toward a firmware regression.
Additional Information:
- The device is operating in router mode.
- No network configuration changes were made except for the firmware update.
Request:Since the newer firmware offers important security improvements and patches known vulnerabilities,
I hope to continue using an updated version without sacrificing network stability.
Therefore, I sincerely request the Zyxel engineering team to investigate this issue and consider fixing it in a future firmware release.
Thank you very much for your attention and support.
Best regards,
vanprasth
All Replies
-
After doing the FW upgrade, have you tried doing a factory reset to see if that helps? Is the problem only when connected via WiFi, or via Ethernet?
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