Get error 66, when try to use TCP vi send string to arduino

I use TCP vi to send string to arduinos (arduino uno+ arduino wifi shield, and they have arduino code preloaded inside ) wirelessly through the router. Sometimes they can communicate well, the arduino receive the string send by the TCP vi. But sometimes, there will be an error 66 come out of TCP Write vi, so, labview loop will stop. Arduino will say "connection failed". And I have config the VI sever allow the arduino to access.
Another thing I want to mention is, when I highlight the execution, the error will come out more frequently.

Actually, they can communicate not only once, sometimes the VI can pass data several rounds, but suddenly the error 66 appears in TCP write, the loop will stop. And if I rerun the program, things happens again. can anybody tell me why the error come out? Thanks

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I am using a USB-6211 and want to measure the speed of a motor by counting pulses coming back from sensors on the motor. Speed will vary from 0 to about 5k Hz.
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Yes, I think you understand my application. The motor can turn from zero to about 5K RPM and one pulse is generated with each turn of the motor.
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