SQLiteDatabase rawQuery hangs

I've created an Android IntentService that downloads data from a remote server and stores in a SQLiteDatabase. When I run the service the first time everything runs perfectly but the second time I try to run it ends up hanging and I'm not too sure why.

c = db.rawQuery("SELECT * FROM abc WHERE def = ? AND ghi = 1", new String[]{Integer.toString(uid)});

It's this line where it hangs so I've a feeling it's something to do with the database being locked and it's wait for it to unlock but I could be totally wrong. I had previously been getting locking exceptions but they appear to have gone. It's nothing to do with the query take a while to execute because normally it executes instantly and I've waited 5 minutes on the second run and it is still hanging

DatabaseHelper.java

public class DatabaseHelper extends SQLiteOpenHelper {

Context context;
private SQLiteDatabase mDatabase;


public DatabaseHelper(Context context) {
    super(context, DB_NAME, null, 10);
    this.context = context;
}

public SQLiteDatabase getDB() {
    if ((mDatabase == null) || (!mDatabase.isOpen())) {
        mDatabase = this.getWritableDatabase();
    }

    return mDatabase;
}

MyApplication.java

public class MyApplication extends Application {

public static DatabaseHelper helper;
public static SQLiteDatabase database;


public MyApplication() {
    super();
}

@Override
public void onCreate(){
    super.onCreate();
    helper = new DatabaseHelper(this);
    database = helper.getWritableDatabase();
}

@Override
public void onTerminate() {
    super.onTerminate();
    if (database != null && database.isOpen()) {
        database.close();
    }
}

}

All database access is done using the one database object in MyApplication. Any insight into the query hanging would be appreciated.