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This is probably because it is running out of memory. Blackberries will automaticall delete your SMS/Emails Logs when it has run out of memory.
Check by going to Settings/options --> Status --> File Free Memory.
It is very low, then you will have to hard reset the device to clear the cache. By pulling out the battery while the device is on, leave it out for 30 seconds and put back in. This should increase the memory. Otherwise delete some apps of the device or clear out emails/sms to make space.
The deleting of messages and/or call logs typically indicates a low amount of internal memory. The BlackBerry devices have what is called a Low Memory Manager that will kick in when the memory on the device gets low.
The quickest way to free up some memory is to perform a hard reset. This is where you remove the battery from the BlackBerry while it is still powered on. Leave it out for 30 seconds, then reinsert. Also, follow the steps in the link below to maximize the memory on the BlackBerry:
i had this problem with my phone, the blackberry is deleting all your messages and call logs because you dont have any phone memory, so your phone deletes everything it thinks isnt important.. so delete some of your pics, music or ringtones, and invest in a memory card! hope that helps!
TRY THIS...Press and hold the up/down bottom left key. While holding this down press L then 5 then L then 5 again. an event log will appear now press the menu key scroll down to CLEAR LOG. USING THE TRACK BALL PRESS THE BALL AND DELETE THE EVENT LOG. These are cookies and will destroy your memory which is very small anyway. Do this from time to time and it should solve your problem. Good luck to all......