[Resolved]  5220 Nokia — Blackout Issues

I bought Nokia 5220 express musin phone and from that very moment the trouble started as the memory card was not getting detected.I got the memory cared replaced thru the authorised outlet but the phone started restarting(blackouts) after that.
I made 2 trips to Nokia care cebtre in RT ngr and this is what they did:

1st Trip: Reinstalled the Software
2nd trip:Formatted the memory card and asked to observe and also suspected virus as the cause of the issue.
What I dont understand that when the phone memory card is formatted how can we suspect virus in there.Anyways, i did what the technician said and still have no releif from the issue am facing.

Weird logic, I am making a 3rd trip to the Nokia Care Centre tomorrow to see what he says this time.