My advice is just off your phone and then on again. I hope this trick will work for you. If there are still the same issues you faced don't hesitate to contact customer support.
I'm so sorry to hear about your issue here. I also faced the same issues. But later on, I noticed that the temperature was so high. And I fixed the issues.
Have you lost all of your data? It would be best if you kept all of your data in Google Drive or Dropbox. In case, you lose all of your data then you can recover from there. Last month, I also lost all my data. I didn't have any recovery.
