H2O Aura memory problem

I don't know why this happens but everytime I try to load a book and then reload it causes serious problems. For example in Calibre after a restart I get

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 87, in run
File "site-packages\calibre\gui2\device.py", line 503, in _books
File "site-packages\calibre\devices\kobo\driver.py", line 1787, in books
File "site-packages\calibre\devices\kobo\driver.py", line 1662, in get_bookshelvesforbook
DatabaseError: database disk image is malformed


and also if I try to plug it into the pc it doesn't turn the frontlight off either

Is this a corrupt memory card?