Support Urgent : Phone rebooting as soon as WiFi turned on

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http://androidforums.com – Hi all, My non-rooted Nexus S has been running smooth on Samsung 4.1.1 update from last 2 months or so. While one of the apps was being updated and installed, I switched off Wifi on the phone. Since then, the app was under "installation progress" for a few hours. I thought of switching on WiFi and since then, the phone is auto-rebooting continually if WiFi remains on. If I quickly disable WiFi, it gets stable. I have also uninstalled the aforementioned app - don't see what else can I do :( I think I should go for rooting and installing a custom ROM. Any help please ? PS : I don (General)