I have a serious issue with the phone, The phone shuts down by itself at least once a day and never boots up until I repair the firmware by connecting to the PC. The Facebook app, maps, markets just force closes most of the time and then the phone just shuts down. I though this could be a firmware issue but after repairing also I am facing the issue.
I cannot take it to the service center as I bought it from a different country. Let me know if there is a solution.