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My internal memory seems to be corrupted. When I open the menu for Apps in Settings it begins by saying I have 339mb used 41mb free then it recalculates and says I have 271mb used and 109mb free. I try and download updates for my apps but it says I have insufficient space. Sometimes in order to update an app I uninstall and then reinstall. Is there something wrong with my memory? Im currently running ICS.
Have you try first to clean cache of apps?
In second order, you can make a factory reset. So you'll have a much clear system and can start again.
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
http://software.sonymobile.com/install_packs/Update_Service_Setup-2.12.12.41.exe
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
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unrelated topic, if you have some time please check this thread
I did try a factory reset and it seemed to help for a while but now the problem is back.