Lasercut stops everytime after a few minutes

Each time I start to cut something the laser stops after a few minutes (3-5) and nothing happens. The only thing I can do is to restart the job (with the same results). I have an Sculpfun S9, the newest Software version of lightburn and my computer is a dell xps with Core I7.
The console says:
Stream wird gestartet
Layer C00
o�H�ok
�ok
�ok
o�
H�ok
o�H�ok

Best regards
Stephan

If you get those question mark symbols, your data transfer is corrupted. Usually, this is caused by a bad USB cable. Try another (high quality) cable and make sure that the communication is not disturbed by external factors (electrical interference, high-power devices at the same power line etc.).

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