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Hi @eidilirvine, very sorry to hear about what has happened. 
I would recommend that you stop using the device and that you get in touch with your Local support team as soon as possible, since the device will need to be examined at an authorized service centre.
If you have any questions regarding the warranty, local service routines and consumer laws, they are better suited to answers these type of questions as well, as they may vary between markets and I work globally.
Once again, very sorry to hear about this!
Common issue?? Just currious smelt toast and found out it was my port
I've had an Xperia XZ for a while now and I haven't experienced this, I don't think this is a common use, do contact your Local Support team to get it inspected.
Hi @infixremix, sorry to hear about what has happened. 
This is absolutely not a common behaviour and we are of course taking this very seriously.
The device will need to be examined by a trained technician at an authorized service centre and you may want to send in both the charger and the cable that you used to charge the device. For further information and assistance with sending the device in, please get in touch with your Local support team.