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Hi @Joanne1, I am very sorry to hear about that. 
I agree with the suggestion posted by @Viridis in this case, but prior to having it sent to service it would be a good idea to try performing a software repair using Xperia Companion just to rule out the software as the cause.
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As in updates, are you referring to information from the service center? I'm afraid service routines, local consumer laws and warranty terms vary on a market-to-market basis. It would be wise to get in touch with your Local support in order to be assisted and get informed regarding your case.