Hi  @Cogerber 

Thanks for posting here.

Please refer to the following to troubleshoot:

Devices retain LAN IP but cannot access the internet, possibly due to DHCP lease or gateway misconfiguration.
>>>

• Access the main router's management interface and verify the DHCP pool is sufficient (to avoid IP conflicts).
• Confirm that new phones obtain the correct IP, subnet mask, default gateway, and DNS (compare with wired devices).
• Try assigning a static IP to the new phones to check for improvement.

Possible Cause: New phones support Wi-Fi 6 (802.11ax), which may cause compatibility issues when mixed with older devices.
>>>Split the SSIDs for 2.4GHz and 5GHz (e.g., name them “WiFi-2G” and “WiFi-5G”) and prioritize 5GHz for new phones.
Adjust channels:
For 2.4GHz: Use non-overlapping channels like 1, 6, or 11, and set bandwidth to 20MHz.
For 5GHz: Choose less congested channels like 36 or 149, with bandwidth set to 80MHz.

Update Firmware and Drivers
Upgrade the EAP225 to the latest firmware (we have a newer firmware version for EAP225 V3, you can download from TP-Link’s official website).
Check if new phones have the latest Wi-Fi drivers (system updates may include fixes).

Symptom: New phones may aggressively put Wi-Fi to sleep to save power.
Actions:
On the phone: Disable “Wi-Fi sleep” or “Smart battery saver” (Settings > Wi-Fi > Advanced).

 

Hi  @Cogerber 

Thanks for the feedback.

It appears this issue is caused by the wireless environment. You can record and keep the current wireless settings.

Anything new comes up, don't hesitate to let us know.