Nokia 7210 Supernova — hanging

Address:

Visakhapatnam, Andhra Pradesh

sir,
my name is krishna reddy. i purchased nokia 7210 supernova mobile 12 months before. whenever i work with my mobile (sms,chatting) it getting white screen and hanging. sometimes in this situation it was getting restart automatically.
recently all the default nokia themes and cliparts are deleted automatically and getting switch off for every 15 minutes.
please do the needfull. Hoping u will solve my problem as early as possible.

K.V.KRISHNA REDDY,
REDDY.[protected]@GMAIL.COM
[protected]@[protected].