First off, congratulations on the running Boston! Hope you enjoyed yourself!
Alan is right -- the way the files were recorded, it looks like the battery was loose within the cap for the first part of the run -- 35 or 40 minutes worth of time till about 11:07 AM. After that, things seemed to settle down and the remainder of the marathon was recorded. Did you receive a warning to check the battery fit when you synced? The system tried to combine as much of the data together as it could into single runs (the scribe had actually recorded 20 separate files due to the battery being loose), but in some cases the gaps between the data were large enough that they got separated into discrete runs. I'm sorry to say that we don't have any tools to patch this up for you. Luckily the bulk of the marathon was captured in one run! Wish I had better news about combining the others....