Calibre add book stopped working.

This week I started having problems with Calibre adding books. If I reboot the entire system it fixes itself for one session of adding. I can add one or multiple books when it fixes itself but after that add it starts bugging out again. Below is an example of the error. I'm using v2.7, Win10. If there's add'l info I can provide let me know.


----------------------------------------------------------------------
Failed to add the book: 18227-Berardo_Building
H:\00. Storage\Books need to be cataloged\Kate Berardo, Darla K. Deardorff, Fons Trompenaars-Building Cultural Competence_ Innovative Activities and Models-Stylus Publishing (2012).pdf
With error:
Traceback (most recent call last):
File "site-packages\calibre\gui2\add.py", line 379, in add_book
File "site-packages\calibre\db\legacy.py", line 217, in create_book_entry
File "site-packages\calibre\db\cache.py", line 61, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 1529, in create_book_entry
File "site-packages\calibre\db\backend.py", line 829, in execute
File "c:\cygwin64\home\kovid\sw\build\apsw-3.8.2-r1\src\cursor.c", line 231, in resetcursor
IOError: IOError: disk I/O error