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Although there is a feature to move apps to an SD card you often find that some of these apps aren't compatible with been transferred and the read and write ability of these apps are missing the code to enable this which is down to the app developers to include this
Hi Sarah8,
Welcome to the community,
You may also want to try backup the SD card to a PC/Mac and then format it, as this may just be a data issue. You may need an adapter to connect the SD card to your computer however.
Let us know how you get on regardless.
Without testing another SD card or formatting the current one, there is no way to tell if this is the SD card slot, based on what you have advised so far, it sounds more related the SD card.
However if you feel otherwise, you are welcome to contact Sony Mobile customer. Use my signature below to find details for your country.