Hi guys, I've already solved this issue but couldn't find any info on it while it was going on, so wanted to share what happened and how to fix it, just in case someone else runs into this. I think this is the most appropriate section to post, but if not, please feel free to move it, mods.
The problem was this: WiFi suddenly stopped working on my rom. It just straight up wouldn't turn on. Pressing the wireless icon in the launcher did nothing, and from the settings menu I'd see the "to see available networks, turn Wi-Fi on" message, even if I turned it on. Coming out of that screen and going back in would show the WiFi was still turned off. Reboots didn't work, uninstalling suspect apps didn't work. I was ready to wipe & reinstall the rom.
The solution is this: I then had what I thought was a really dumb idea. Try changing the WiFi frequency band. It worked. I'll explain what I did step by step;
Long press the WiFi button in your notifications bar, or go to Settings>WiFi
Press the menu button (either the menu key on your phone, or the three dots at the top left of the screen) and select 'Advanced'
Tap on 'Wi-Fi frequency band', and change it from automatic to '5 GHz only' (it may be your WiFi is on the 2.4 Ghz band. I'll come to that)
Reboot your phone
If your WiFi is on the 5GHz band, and your issue was the same as mine, it will now connect to the network and you'll have internet (you may need to turn WiFi on, first)
If it didn't, repeat the steps above, but this time choose '2.4GHz only' instead of 5.
Hopefully you'll now be online again. If you like, you can now change the frequency band setting to automatic again, and the WiFi should work just like it was before.
I really hope this can help some folks who might experience this in the future. It was such a weird issue, and it's such a simple yet obscure fix. With any luck this'll prevent any unneeded wipes.
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