I don't know what happened to the wireless but one day after I got off the phone it froze up and I had to hard reset it, holding volume down and the power button. And when it came back on my wireless wasn't picking up anything a d my Bluetooth isn't able to be turned on.
You can probably replace all of the in one pass with Nokia Software Updater. Of course you will need a good backup available to restore your apps and settings. You will also need a PC to run NSU and reload your phone. I used it to be sure I could go back to the GDR2/Amber update from the developer GDR3 release. It worked fine.