(RADIATOR) Lost Carrier

[tech ref]

I've written a program to telnet to 96 cisco devices one by one to do
something with authentication by Radiator in Windows 2003 server at night.
I found that after 50 devices, the rest had not done. From the log, I found
that the connection is not lost between the devices and the Radiator. There
is Access-Request, Access-Accept, Accounting Request etc. But I found that
Acct terminate cause message is Lost Carrier.
What does it mean and what is going wrong. How can I solve it?
Thanks.
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