Hi Ex-jobb,
your link to the data is the reference handle (ObjHandle) from the ncOpen.vi. I'm not sure, if I understand you correctly, but as long as you don't close (ncClose.vi) that handle, you can access the received data through that handle. If your dataflow allows, wire the ObjHandle into your next loop, too.
If that isn't permitted because of the data flow, you could create a local variable for the ObjHandle and read from that in your next loop.
Please describe your problem in more detail (screenshot, VI, etc.), if I seem to misunderstand.
-B2k