We've seen something similar with a 10 - 25 MacBooks connected at once on an Airport Extreme, and I wonder if it's related – as it all worked fine before, for m

We've seen something similar with a 10 - 25 MacBooks connected at once on an Airport Extreme, and I wonder if it's related – as it all worked fine before, for months. Is the solution to downgrade everyone to 10.10.2 or upgrade everyone to 10.10.3?