Cseries :: C6-01 No Longer Prompt For New Message After Firmware Update

I owned nokia C6-01 for about 2 months and update my firmware to PR1.2. I also put the 'notification widget' on my first homescreen. The notification will notify incoming message and miss call event. Recently, I noticed that widget didn't prompt any message notification even though I received a new message. I thought this must be widget problem. So I remove that widget.

However, when received new message, the phone not show a new message alert. But, the message icon (on top right,if in portrait mode) can be accessed to preview the message. To revert back my phone to normal, which to normalized 'notification widget', I restarted the phone. And put back 'notification widget' on my first homescreen. Then, everything was fine. Until for a few days,the problem same still after my phone.