[Bug 215265] TP-Link TL-WDN3200 device periodically loses connection on some networks

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215265

            Bug ID: 215265
           Summary: TP-Link TL-WDN3200 device periodically loses
                    connection on some networks
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: yuri at rawbw.com

This device
> ugen3.2: <802.11 n WLAN Ralink> at usbus3, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON (450mA)
> TP-Link  TL-WDN3200  idVendor = 0x148f   idProduct = 0x5572
works fine with some wifi networks, but periodically loses connection on other
networks. Pings to the local router get lost while ifconfig shows that device
stays up and running.

> wlandebug +crypto +assoc +state
doesn't print anything at the moment of failure and later.
TKIP is used in both observed working and failing networks.

There is some factor in some wifi networks that causes failures which isn't
obvious. I mostly observed successful work on the networks where I was the only
or major user so this may be the factor, or this may as well be coincidental.

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