Weirdness when using wifi hotspot tethering

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http://forum.xda-developers.com – Hi all I'm hoping you can help me. I have the R800a model of the Xperia Play, running 2.3.4, stock standard and not rooted. I'm experiencing some very strange behaviour when I turn on wifi hotspot tethering on my phone. When I do, it seems some 3G functionality in the phone is lost. I can still browse the web in Dolphin Browser, but TuneIn radio stops working completely, saying there is no connection. As soon as I turn wifi hotspot off, it picks up the connection again, but if I turn it back on...bang, drops out. For the record, devices connected to the hotspot, such as my Nexus 7, can acce (HowTos)