Communication - Do you ask questions when you're stuck?
Many developers sit with their faces to the screen, isolating themselves from the team, trying to solve a problem on their own. If you're stuck on one bug for more than an hour, ask someone to help.
No-one gets a medal for solving a problem on their own in 2 days, when it could've been solved by 2 people in a couple of hours.
The Daily Scrum is a good time to bring up any ongoing issues or sticking points if you haven't already.