Hello,

I am experiencing persistent Wi-Fi instability with my TP-Link Deco mesh system, despite running the latest firmware and performing extensive troubleshooting.

Configuration:

• 3 × Deco X1500 (indoor units)

• 1 × Deco X50 Outdoor (currently removed from the mesh for testing)

• Operating mode: Access Point

• Vertical house (Ground floor / 1st floor / 2nd floor)

• Wireless backhaul only (no Ethernet)

• Firmware: latest available via Deco app

Symptoms:

• Regular Wi-Fi freezes every few minutes (15–30 seconds)

• Client disconnections

• Issue reproducible even with the Deco X50 Outdoor completely powered off

System logs observed repeatedly:

• rtk_get_vap_status: cfg80211 return -19

• ar_apinfo_collect: AP sync timer expires!

• Frequent VAP recreation

• Abnormal activity from the mesh controller daemon nrd

• 802.11k measurement timeouts and forced roaming events

Tests already performed:

• Full removal of the Deco X50 Outdoor from the mesh

• Factory reset and full reconfiguration

• Fast Roaming / Band Steering / Beamforming disabled

• Preferred connection fixed between Deco units (2nd → 1st → Ground floor)

• Tests with and without Ethernet backhaul (the issue disappears immediately when at least one Ethernet backhaul link is present)

Conclusion:
This strongly appears to be a firmware issue in the wireless mesh implementation (nrd / Realtek cfg80211 driver) when three or more Deco X1500 units operate with wireless backhaul, especially in a vertical topology.

Could you please:

1. Confirm whether this issue is known for the Deco X1500 series?

2. Advise if a firmware fix, beta firmware, or stable older version is available?

3. Escalate this case to the firmware / mesh development team?

I can provide:

• Full system logs

• Exact timestamps

• Network topology diagram

Thank you in advance for your assistance.

Best regards,

Sébastien