Device: Nokia N97
Product Code: 0576474 GR
Firmware: 11.0.021

 

When the screen is locked and I press any button, or a message/unanswered call occurs, the homescreen instead of dimming, goes totally black.
It happens 8 out of 10 times.

 

 

To be more spesific, instead of looking like this:



 

 

it looks like this:



 

 

**I only use the N series 1, 2 and 3 themes that came pre-installed on my phone
and this happens regardless of the theme.