I've now had Swisscom Support do a rest of the SIM card. Now watch for a few weeks to see if that helps. I think the next step would be to send the device back as a warranty case. It can't be.

Mine has also been losing connection constantly for 3 weeks. I tried to contact FreeFunk, but that is also catastrophic to possibly impossible. There's only WhatsApp but that hasn't worked so far either. I suspect very, very bad things. Everyone will blame each other again. What have you already done? I'm curious what you will report.