Nexus7 freezes on the X screen after tethering

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http://forums.androidcentral.com – I am able to tether my Nexus 7 to my iphone no rpoblems and access the internet. However after i have un tethered the Nexus 7 it will freeze on the X screen This is the second nexus 7 this has happened with, the first one was returned last week Any ideas? Richard (HowTos)