I found that I was replacing the normal interruptions of the office - meetings, email, phone calls, lunch; with getting distracted on social media, general reading, checking alerts, etc. It was like my brain was conditioned to expect a distraction and thus made me seek it out.
It took some effort, but making sure I am organized for the week has really helped as I know what I need to get done. Also, I've now been able to use my "distracted level" as a litmus test of how organized I am. I know when I'm not focused as much as I should, I need to spend some time on my planning.
edit: grammar