What else is in the tank? How big is the Tank?
Schooling fish school mainly for protection and comfort, but they don't need to school all the time.
I have 10 of them as well in their own 20 gallon tank right now and they roam all over the place by themselves, its because they feel safe (nothing else in the tank) and have adapted to their new home (for a couple weeks now) and are comfortable with their environment (heavily planted, lots of hiding places). Honestly, even when sleeping my Rasboras aren't by each other, the only time I ever see my rasboras school is if they get scared by something (recently the city was working on some street lights by me and disconnected the power briefly 5 times over the course of two hours so the fish suddenly had their lights and filters stop/start working a lot, it freaked them out)