Wery strange problem in my Lumia 640XL OS-8.1, can I get some help?

[ErJaspreetSingh]

very strange problem in my Lumia 640XL OS-8.1

I have very strange problem in my Lumia 640XL OS-8.1

I'm trying to make you understand By explaining all -

I had 300mb appox memory left in sd card. I deleted movie from torrent. Memory become 1.5gb free.
And.. I copied some data like mp3 files a movie and some videos.. Download some pics also from fb n other social networking sites.

Suddenly phone get slow I did soft reset.
When it restarted my deleted data back and saved data from last hour is automatically deleted. Even chat messages too

Its happening still now. I restarted my 3-4 times and copied data too. It happens 8hours ago.

Tell me why its happening. I know hard reset and memory card format will be solution will suggest by you

 

[ErJaspreetSingh]

Re: very strange problem in my Lumia 640XL OS-8.1

My phone automatically get restore to 2:16pm when I restart my phone
Data deleted come back and stored data after 2:16 got delete.

I tried it so many times. Took screenshots. Download images etc. Etc.