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I upgraded to the latest version of OS for my Blackberry Curve 8520 about 6 months ago.
Since then my calendar entries for the past 3 months are automatically deleted without prompting. I have also noticed that my phone becomes quite sluggish, showing the loading sign often, and my messages are also automatically deleted without prompting.
For the record, I have plenty of free memory and I have always had my settings set to 'keep forever' for both calendar and messages. And I do not synch my calendar with any other calendar.
From my research I understand that this is a widespread issue and I would appreciate your advice on how to solve it.
Furthermore, I would like to know what RIM is doing to fix this issue which is affecting so many Blackberry users.