Fix DAQmx Status Code -200557

[jondoesntgit]

Occasionaly, runing daq.read() spits out these errors.

Status Code: -200557
in function DAQmxStartTask
DAQmx Error: Specified property cannot be set while the task is running.

It doesn't trigger any exceptions, but terminates the read almost instantly. You end up getting a large zero vector.