[Plugin: PDO (SQLite) For WordPress] SQLite timing out

I have the latest version of WP and the PDO plugin. What is happening is that if there has been no activity on the site for some time, and then someone visits, they are getting the following error:

==
Fatal error: Maximum execution time of 60 seconds exceeded in /Path-to/wp-content/pdo/PDOEngine.php on line 453
==

Everything is ok after a page refresh.
Not sure where to start, have had a look at the code and it is trying to execute a sql query.

Any ideas?

http://wordpress.org/extend/plugins/pdo-for-wordpress/