Just a brief note for emphasis: your need to "unreserve" after stopping seems to be a requirement that's unique to the use of USB-based DAQ. It wouldn't be (and wasn't) needed when running on a desktop board. Glad you got a solution!
-Kevin P
ALERT! LabVIEW's subscription-only policy came to an end (finally!). Unfortunately, pricing favors the captured and committed over new adopters -- so tread carefully.