Wanted to keep this thread updated. Thanks everyone for the help. These forums have been great so far! The next day after this post, I discovered that the battery is still not charging properly, which is why FM had me send it back in the first place. I plug it in, the cord's green light changes to red, and it appears that the board starts charging. I leave it over night and come back to no green or red light at all and find out that the board has only charged about 10%. This is exactly what it was doing before I send it back 2 weeks ago.
After reading this thread and thinking back to the past incidents of the "accelerating without stopping" incidents, I realized they have all been in the 30% batter or less range. So that seems like a big red flag since the board went back for failure to charge and is still acting up. Sigh. I have a note out to FM and assuming it will have to go back again. Pretty damn frustrating.