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Overheating
In the last week, battery efficiency has dropped significantly.
Today, due to a severe overheating, the cable has been melted and the input used for charging has been damaged
Surriscaldamento
Nell'ultima settimana l efficienza della batteria è calata notevolmente .
Oggi a causa di un grave surrsurriscaldam ha fuso il cavo e danneggiato l'ingresso adibito per la carica
I've edited your post as this is an English only forum, you can use Google Translate to reply and/or post.
I'm sorry to hear that but the phone shouldn't overheat, if it gets too hot it will shut down, as for the cable, was it a Sony cable?
Either or, contact your Local support to get it your device inspected/repaired as this is a global user baseed forum.