I am fresh owner of Archer A9, using wifi without password & access list - whitelisting allowed devices.
After some time, usually next day, I cannot connect one of my whitelisted devices ( random ) to my wifi ( devices are not changing mac addresses ). I have to remove its MAC from whitelist and re-add back and then it works.
It is not blacklisted due to DDoS - just a side note.
Any idea what should I check or where to report it ir should I return it because of issue under warranty?