No, definitely not. It's a hardware issue so reflashing is going to have no effect.

Go to Tools->Control Panel->Device and in the About Device section it displays the WLAN code that doubles as a serial number.

You could also remove the battery and find the code there but then you'd have to reboot - probably inadvisable .

Does anyone have any idea just how prevalent the WSOD is? Is it something like 10% or 15% or 20% of devices that experience it?

I guess it will be impossible to find out as Nokia are unlikely to have released that sort of information but just going by posts on various forums it does seem to be common enough to indicate something in the 10-20% range.