Thanks for reply.
We could see that the SD card space has got 14.13 GB used of 14.81 GB.
1. Please try sorting out the data in SD card and try again.
2. If step 1 is not working, would you please try factory reset and see whether the problem is solve or not?
Setting/ Backup & reset/ Factory data reset
Please remember back up all important data in advance.
And you could also come to our service center with proof of purchase, such as warranty card, invoice and receipt. Thank you.