Part of the Furniture
That's what we call an unsubstantiated claim, not proof.
It doesn't matter how you call it. You are still fighting with the issue - find your fix. I shared with you my experience. What I found inside this specific AC86U model is described here, with short list of common issues and symptoms. Based on my findings, my recommendation is to replace it. What you are going to do with your router is your decision. Complaining in every thread how bad Asus is definitely not going to fix it for you.