Just to give a few more information: the issue seems to be related to the 5G radio operations, in particular in mobility scenarios, when the modem jumps between different cells quickly (i.e. on a train trip).
That is the reason why disabling 5G seems to help reduce the occurrence of the issue.
The issue does also affect only some carriers, because of the different infrastructure and radio settings deployed across Europe.
Our team has spent days investigating the issue, even by going back and forth on trains with multiple devices in their hands and we now have a potential solution that we will be testing as extensively as possible during the coming days.
Beware that “potential” is the keyword here, as the solution might not work as expected or might be too unstable to be publicly released, but we are definitely making some progress.
I (or one of my colleagues) will try to keep you informed about that.