1. Do you like the work you do?
2. Do you like the folks you work with?
3. Are you learning/growing?
If you answer NO to any of these then ask WHY NOT?
No one can answer these questions but you! Other folks can help you GET to your answer but at the end of the day it's up to you! If you answer NO, ask yourself how can i change that to a YES? Can I get involved with other projects at work? Can i spend more time with my colleagues to get to know them? Can i signup for an on-line learning site? Or ask other team members how they do their work?
If there is no good answer or action plan you can put together it might be time to move on our look for other opportunities.