Why is wlan0 gone?

I have this machine under BunsenLabs Hydrogen (Debian Jessie pre configured for Openbox) for ~6 month. Was pleased with it and everything worked fine. About 2 week ago, a new linux-firmware-amd64 version came out, and I started to have trouble with wifi after making the PC sleep/hibernate. However, since yesterday, I have no wifi. At all. My first thought was that iwlwifi must have gone corrupt or something, so I reinstalled it, reboot and... nothing. After looking around a bit, I see that wlan0 just stopped existing: drakasan@bld219:~$ lspci | grep Network 02:00.0 Network controller: Intel Corporation Wireless 7265 (rev 61) drakasan@bld219:~$ rfkill list 4: hci0: Bluetooth Soft blocked: no Hard blocked: no drakasan@bld219:~$ iwconfig eth0 no wireless extensions. lo no wireless extensions. Now I m as stuck as I am baffled. How can wlan0 just disappear like that? I would have expected that tw week ago with the kernel upgrade, but not two week later. Also, booting from the old kernel doesn't work either. Kernel: 4.9.0-0.bpo.3-amd64, can boot on 4.9.0-0.bpo.2-amd64.