[Bug 240776] [iwm] can't find wifi networks after short time since network restart

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240776

            Bug ID: 240776
           Summary: [iwm] can't find wifi networks after short time since
                    network restart
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: wireless at FreeBSD.org
          Reporter: johalun at FreeBSD.org

This has been a long existing problem for on my Dell laptops. Always running
recent 13-CURRENT and the hardware is

iwm0 at pci0:2:0:0:        class=0x028000 card=0x00508086 chip=0x24fd8086 rev=0x78
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Wireless 8265 / 8275'
    class      = network

The other Dell laptop has the previous generation of this chip.

After using the laptop "normally" (wired or wireless) for a while, it stops
finding networks on scan with the result that roaming almost never works (it
doesn't find other networks as I move between work-home). I've tested this with
and without lagg failover configured.

As soon as I do 'service netif restart' it can again see all networks with
'ifconfig wlan0 scan'. For a while that is. After a short time (sub-hour to
hours), scan will show either only a subset of networks or none at all and the
only remedy is to tear down the interfaces and configure them again.

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