Thank you for contacting ASUS support!
Sorry to hear about this issue.
Could you please send us feedback through Web GUI when using the firmware 3.0.0.4.388_33903.
You can submit a feedback from Web GUI (asusrouter.com or router.asus.com).
1. Connect your device to your router and log in to Web GUI.
2. Find “Administration,” and tap “Feedback”
3. Fill in your region, email (required field), ASUS Service No./Case No. (not required), Select the feedback problem and description. You can also write down comments/suggestions. More details might help us to analyze the issue you have encountered in a faster and more efficient way.
4. Read the agreement and click “I agree.”
5. Tap “Send” to submit your feedback.
Then provide the product serial number, the time of submitting the issue report, the email used for filling out the issue report, and the time when the issue occurred by answering in this email.
Wishing you a great day!