I have solved the problem by replacing the original security line with a 2mm dyneema line. According to the ]manufacturer], this rope has a breaking strength of 410daN (kg). Now it seems to be working properly.
https://www.kanirope.fr/corde-dyneema-p ... e-kanirope
I have to say to be honest that I have had emails with Swich and they have offered me a possible solution. In these days I am away from home but as soon as I return I will try it and I will tell you. If I have to thank the brand's response, unlike other manufacturers with a recognized name, when you have a problem, they do not respond to emails despite being recognized by manufacturer failures.