Hello@VickenD ,

To help assist and streamline the identification of the behavior, we recommend sending an email to support.usa@tp-link.com with the following information:

• Subject: [Forum Escalation][ID 836296] The Web UI displays the error message'Interface return exception'
• Forum Nickname: VickenD  
• Thread URL:https://community.tp-link.com/us/home/forum/topic/836296
• Model&Version: Archer BE800_V1_1.2.4 Build 20250414 rel.18315(5553)
• Description:  Receiving this strange message flash at the top center of the screen and disappears quickly upon every log in. It happens across multiple browsers and different computers. 
• Other Relevant Information:

1. Please collect har file of the browser. Refer to How to Generate a HAR File in Chrome, IE, Firefox, and Safari, Edge
2. Have you enabled the LED control function? If so, does the LED control page easily display this error message, affecting other pages? You can disable LED control for comparison.
3. Is the LED panel functioning properly? If you modify the settings, do they work properly?