Have you taken a look at this article:
http://digital.ni.com/public.nsf/allkb/C4E77D7E9BECBAFE86256C6200544289?OpenDocument
It mentions changing the connection time out settings. This could fix the issue.
How is the FP controller connected, directly to your PC?
What is the IP and subnet of your PC and FP controller?
Applications Engineer
National Instruments