Why are some of my contacts getting deleted automatically on my Lumia 520?

[kakarott]

Some of the contacts are getting deleted automatically in Lumia 520

Hello friends,
I can't see some of my contacts, that I have saved previously in 520. I called on this number last month and now I see there is no contact for this name. It's like some contacts are getting deleted automatically.
Please help.

 

[EasyOn]

Re: Some of the contacts are getting deleted automatically in Lumia 520

Did you save only on the SIM card or are you backing it up with Outlook email?

 

[Aniket Rajnish]

I'm having the same problem with my lumia 530. Did you find a solution?