I having the same problem as this. after i removed and re entered my wifi login. also i had been on holiday and logged into a few other wifi routers.
when i re entered my home wifi it just kept turning off and saying "unable to scan networks"
its a vodafone UK contract Galaxy S (if that makes any difference)
I tried to root my phone using
[PROGRAM] One Click Root/UnRoot I9000 (Eclair and Froyo) Mac and PC
it seemed to work . i had an extra app for changing a few settings. but i still couldn't find the wifi file i need to delete? Had it not been rooted properly?
I'd really like to fix this without having to do a master reset every time?
What are my options?
Could i take an image of the mobile and remove the file from the image? then restore the image. A bit crazy if routing is not a possibility?
Can anyone help?