elumia 710 call can't be ended..

[surezzh]

Hi am Suresh from India just 3 days before I bought a Nokia lumia 710.
Since purchasing this phone am facing the problem of CALL can't be ended even after pressing call end key
For several time . Then the phone goes in hang mode and restarted automatically.the problem is persisting even after changing the sum and factory reset.
I hope lot of customers experienced with this lumia 710 & 800 in rest of the world.
Let us see Nokia what will do for this problem.

Suresh
Chennai. India