Hi @classbird,
yeah, if I understood correctly, here it is also Vodafone now. So, I had another visit from the technician earlier this week, when after verifying the cable signal inside and outside the building, the modem was changed for a new one once again (another CH7465VF), but the problem remained. After contacting the support again, the modem firmware was upgraded to CH7465VF-NCIP-6.12.19.7-GA-NOSH, but with no real effect. After calling again, the central support informed that the monitoring system was disabled since Wednesday, so I'll have to wait until next week after the holiday