1. You could have an OS problem or hardware issues.
Simplest first to troubleshoot the OS, by loading a newer, updated OS release.
http://www.blackberryforums.com/general-9000-series-discussion-bold/188088-latest-os-9000-4-6-0-451-4-6-0-266-multilanguage.html
2. If you can live without performing a backup of your device you can follow these steps to correct the issue:
1. Download the latest Vodafone UK firmware using this
LINK (4.6.0.282)
2. Install the firmware onto your PC running BlackBerry Desktop Manager
3. Go to c:\Program Files\Common Files\Research In Motion\Apploader and delete the vendor.xml file.
4. Connect your device and open Desktop Manager
5. When prompted select "Upgrade Now" (If you are not prompted select Applications Loader > Update > If your device isn't detected remove the battery and connect the device > once the update starts insert the battery again).
6. Follow the prompts and your device will be upgraded.
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