I have a similar issue on a modern laptop with a workaround for you which may help. My acer f5 573 55lv will also only work properly with either the wireless in the devices for sys-net or the wired (collectively or separately - as you have the same bridging as i do with a card reader plus ethernet arrangement - that i use so infrequently i forget if have just the ethernet & not the reader is ok). It's all down to the conflicts caused by the necessary evil of bridging & the demands of dealing with how xen currently copes (due to current capabilities & security). Give a try like this - boot laptop up, shutdown sys vms if they ever got started & then enter the device list of qubes vm qui specific to the sys-net & make sure that only either bdf 03:00.1 is listed or both 03 devices if you want wired access to work, bdf 02:00.0 if you want wireless to be possible. Then try to start sys-net & if it starts ok then try sys-firewall. I have noticed also issues where if you could get both wired & wireless devices assigned (different hardware) the nm solution seemed to only cope with the wireless from the gui if you disabled the wired from the sys-net devicelist (or i am misremembering something).
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