How to solved this serial comunication problem?

Hello. I have a problem with serial communication in Matlab. I am sending information to an Arduino board to control some motors. When I send the information using a Serial monitor, all work perfectly. But when I do it using Matlab I need close the port, and open it again every times that I send something. I thought that could be the buffer and I tried to use the command "flushoutput" and "flushinput" without success. What could be the problem? Thanks in advance

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What happens if you do not close and open each time you want to send something?
What are you configuring as the line terminator?

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2021-8-20

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