Weird wireless phantom device

[Rick Jones <rick activeservice co uk>]

I'm getting a repeated problem of my WiFi device showing up twice in NM. This isn't really an NM problem, but I'm hoping someone here will have an idea how to fix it.

The device appears twice in DBus, which is obviously the source of the problem, as NM is just listing what it finds. Both entries in DBus are identical, and point to the same device (which messes up NM as it tries to open and connect on the same device twice).

The DBus node names are almost identical, the second entry just has an extra _0 at the end.

The output of lspci shows only one device:

01:00.0 Network controller: RaLink RT2860
        Subsystem: RaLink Device 2790
        Flags: bus master, fast devsel, latency 0, IRQ 19
        Memory at f8000000 (32-bit, non-prefetchable) [size=64K]
        Capabilities: [40] Power Management version 3
        Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+ Queue=0/5 Enable-
        Capabilities: [70] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting <?>
        Kernel driver in use: rt2860
        Kernel modules: rt2860sta

Running "lsmod | grep 2860" shows only one user:

rt2860sta             513240  1 

Whether one or two devices show up is set from boot, and it seems random when I re-boot what I'm going to get.

Anyone got any ideas?

TIA Rick