pues como te acaba de decir ROMIE

parece ser que es un bug del firmware el w910 con la version R1ea030
estos son los bugs solucionados y los nuvos encontrados en este firm para w910:

R1EA030
- Released on SEUS on 20/02/2008

Performance
- JBenchmark 3D LQ: 396
- JBenchmark 3D HQ: 425
- JBenchmark 2: 1042
- JBenchmark 1: 7140

Software versions:
EROM: 1200-4341
SEMCBOOT: R6A012
LCD: 200708310
Camera: 1.7
Videocall camera: 3.1
Content: PA24
Java: 8.2
Text: BB

Bug fixes
- Phone operation speed is much improved;
- Transitions in Pictures are now animated and much quicker;
- Media menu is much quicker and responsive;
- Accessing and updates from the memory card is faster;
- MP4 video and audio now remains in sync;
- manual EQ settings are retained;
- Wallpaper bug now fixed;
- No reported phone freezing or crashing;
- HSDPA now selectable in Connectivity > Mobile Networks > GSM/3G networks;
- Scrollbar in web browser now resembles Mac 'Aqua' theme;

Bugs
- Phone responsiveness diminishes when is played in the background;
- Theme changes back to default if the theme is not saved in memory card [M2];
- Auto reboot occurs when user uses the phone too intensively. [Eg. Pushing the phone processing power to the limits];
- Sleep mode clock bug still not fixed;
- Java applications that use an Internet connection no longer display the internet connection icon when connected.
- Folder quick search no longer works correctly in sub folders.

Intermittant / Non-working functionality
- Adding a theme that customises the Media Player causes the background to turn black if rotated into Landscape mode. This did not occur in previous firmwares.


pero con la version R1FA030
ese bug y otros se corrigen:

Software versions:
EROM: 1200-4341
SEMCBOOT: R6A008
LCD: 200708310
Camera: 1.7
Videocall camera: 3.2
Content: PA25
Java: 8.2.1
Text: BO

Bug fixes
- sound quality improved;
- Media Menu speed improved;
- Issue with Media menu wallpaper disappearing when rotated fixed;

no se si pase lo mismo con tu w890