FlowArm PLTW Ver.4 is unstable

Hi!

I require your help regarding a problem I’m encountering.

Software FlowArm PLTW Ver.4 often break the connection with circuit board.
The motor stops suddenly while loop running by this.
(Software is running but circuit and motor not.)
(Doing in 9600 and com port is right.)

There was no such trouble in the previous version, so I tried to install the old version, but I could not activate it.

How can I solve these problems?

Thank you so much in advance for your help!

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