We purchase an abundance of Archer C6 routers and resale them to rural Customers. I have noticed that When using the Tether App to upgrade Firmware, the app will download and  install the V2_201010 version. When this happens, The customer will experience and issue of the Router not renewing the lease after it expires causing the mac binding on the ISP switch to stale off, requiring a reboot to resolve. We use dhcpd on linux to issue IP's. Majority of the routers still have V2_191112 on them with no issues, we only see it when the customer has upgraded. The fix is to manually download the latest 210226 firmware and install.

Hope this helps anyone.

 Thanks, 

    Sean