It's really hard to tell for sure why your query did timeout a week ago without having any information. The only thing I can see from the screenshot is that you have tempdb contention (2:1:88968 is PFS tempdb page). Please read these articles to get familiar with thess kind of issues:

http://www.sqlskills.com/blogs/paul/the-accidental-dba-day-27-of-30-troubleshooting-tempdb-contention/

http://www.sqlservercentral.com/blogs/robert_davis/2010/03/05/Breaking-Down-TempDB-Contention/

http://www.brentozar.com/archive/2014/05/tell-need-tempdb-files/

http://sqlblog.com/blogs/adam_machanic/archive/2011/04/21/analyzing-tempdb-contention-a-month-of-activity-monitoring-part-21-of-30.aspx

Basically you need to create more tempb files to avoid this issue. But if this really the reason why the query had got timeout? Who knows. But I doubt it.