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I'm sorry to hear that, contact your Local support to get it inspected, since you dropped it in the toilet perhaps there are cracks on the phone.
Hi @zoe_1995,
I'm sorry to hear that. 
As uliwooly said your phone needs to be examined at an authorised service center before it can be determined if this is a warranty case or not. Get in touch with your Local support team for more information on how you can proceed from here.