Conclusion: It is 90% certain that the accus are worn out and thus the Bluebots aren't responding correctly anymore.
We'll order 6 new accus... and while we're ordering anyway, also a shitton of other accessoires to augment the Bluebot experience. The principal gave us the go-ahead. :D
Just a shame that all educative things are so expensive. But oh well, the school's got a budget for this kind of stuff I guess.
#Work