ComfoAir Connection Closed

Hi all,
I try to use the ConfoAir imlementation "node-red-contrib-comfoair V0.0.8".

It is working fine for some time, but after a while i'm getting this error:
"comfoair [/dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller_D-if00-port0] runCommand(getFanState): Connection closed. Please open Connection first."

Can someone help me on this?
If you need more detailed information please let me know!

The envirement is an Rasberry PI with node Red installed.

Thx a lot up front!

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