Please, please, please, verify that none of the devices have IPv6 enabled. This will, will, absolutely WILL cause all kinds of networking issues. Don’t ask me why, but this has been a known issue for a while. I even have a blog post about it from way back.
This talks about the connection to the outside internet vanishing, but since then, I’ve seen this affect internal connections too.
Also ask @cleoqc about how to check/verify that IPv6 isn’t enabled on the 'bots either.
I can’t speak for the rest of Modular Robotics, but I CAN say that the “Dexter Industries” support is stellar.
Unfortunately, corporate takeovers wreck havoc on communication sometimes and there have been a few bumps. (Especially since this happened right around the Holidays too.)
I would strongly recommend and encourage your school to reconsider its decision not to continue with the purchase of the GoPiGo 'bots.