Activation issues

I'm the IT person at a Community College and we just started using Sage 50 Student edition in January.  Now, as we have finals next week, almost all of my computers are asking to activate.  Some are going through and some aren't.  Many of them are failing to contact Sage servers and some are just bombing right after opening Sage.  

We've installed the software using the disc that came with the instructor's book (the Student Version of the software) with that particular serial number.  I know we have 14 months to use it but it's only been 4.

Any help would be greatly appreciated.

Thanks