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Try a program on your Pc called H2testw to see if the card is corrupted or is a fake - Source here
In this case,stop by a sony service:
http://www.sonymobile.com/global-en/support/contact-us/
Could be,but a class 10 microSD shouldn't have this kind of issues.
Yours is UHS I (ultra high speed I) which is faster than class 10.