Error code from only 1 state machine

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Error code from only 1 state machine
#1
Hi, 
While I am running 9 bpod boxes, only 1 bpod has some trouble while I am doing it. It's not happening all the time, but sometimes, it stopped with this error. It seems not the code issue, do you have an idea how to fix this ?

Error using ArCOMObject_Bpod/read (line 348)
Error: The serial port returned 0 bytes.

Error in RunStateMachine (line 42)
       SMA_Confirmed = BpodSystem.SerialPort.read(1, 'uint8');

Error in RunStateMatrix (line 2)
RawEvents = RunStateMachine;

Error in A_DC (line 86)
   RawEvents = RunStateMatrix;

Error in run (line 96)
evalin('caller', [script ';']);

Error in NewLaunchManager>LaunchProtocol (line 706)
run(ProtocolPath);

Error while evaluating DestroyedObject Callback
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#2
Hi Kyuhyun,

Please share some details about the system:
OS (e.g. Windows 10, Ubuntu 14),
MATLAB version (e.g. r2017a),
Bpod state machine version (r0.5, r0.7-0.9, r2)
CPU (e.g. Intel Core i7 @ 3.3GHz)
RAM (e.g. 8GB)

Is there anything different about the PC that is crashing, compared to the ones that are stable? (different software installed besides Bpod? Other devices plugged into USB?)

Thanks,
Josh
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