Yes it does happen quite often in my 6600, some files in mmc got lost for no apparent reason at all! I have a worst experience when all my inbox messages in the mmc was lost, that is why now I set the save inbox messages to phone memory. I think it is a bug on 6600 v3.42.1 s/w version, wherein the mmc files are being corrupted.
There is a solution to recover lost files in your mmc, but not always effective (take chance, this is better than nothing):
1. Put your mmc in your card reader.
2. Open your PC's Scandisk application.
3. Select your MMC drive letter and run Scandisk.
4. The Scandisk will repair bad files in your mmc.
5. Remove mmc from card reader and insert it in your phone, check if the missing files have been restored. (50-60% chance that files are recovered)
This is just a temporary solution, you will again lose files some other time. To be safe, use phone memory to save your inbox messages and as much as possible, install apps and s/w in phone memory too. The ultimate solution: UPGRADE YOUR 6600 TO A HIGHER FIRMWARE VERSION.
'Hope this helps...
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