Freelance Trend Server

Problem with frozen lines.

Freelance ver 2013. The customer has a lot of trends, 50 trendpages ore more. 99% works perfect
but sometimes one line gets frozen. The other 5 lines OK.
It is only on one of 7 stations at a time. Problem is solved if the line is temporary changed
with an another signal.
I guess it´s a PC-problem. Anyone that has any experience?

Best
/tore