For last few weeks, I am having problem that all unsaved text messages are deleted automatically. Also sometimes when any text message is received on cell, it gots deleted within a second. Then I have to restart my cell to stop this automatic deletion for 1-2 days.
If the RAM memory gets full, it will automatically delete items to be able to have enough room to function. You can check your file free memory by clicking Options>Status. If you are under 5 Mb, that would probably explain your issue. My guess on limited information is you're well below that.
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