Xolo Q800 phone no deleted automatically


Right off the assembly line
I bought Xolo q800 1month back.It is performing beautifully but only prob is that I am loosing my imp phone nos every day.Even if I saved again it gets deleted .I don't know wheather it is a software prob or I have done some wrong setting or synchronising wrongly(though I stopped sync now but prob did not stop).I am new to android.please help.Is it a virus prob? I installed avast free edition and many other apps and games.
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