Phantom 4Pro

Help! We have had our Phantom 4 Pro for around 2 yrs and never had an issue. Sent her up yesterday and she just dropped straight out of the sky and has sustained a heap of damage. Any ideas what could have happened and what we can do to find out what caused it?
Apparently the controller said ‘lost signal’ just before it dropped…this has happened before but never caused it to drop like it did

Please upload your TXT flight log here and post the link to the uploaded log back here.

Where was the battery when you found the Phantom?