Hello, so i have had the xperia u for around two weeks now and its great but i find when i unplug the usb cable after charging it restarts and every so often the phone will come up with a message saying "sim card removed" also when i press the power button to unlock the phone on the screen it some times says that i have a text. For example, yesterday i was on the lockscreen and it said that i had 7 messages when i actualy had none.
Any help would be greatly appreciated 
-Liam
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