same issue here in Austria
webkeeper
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Post
Replies
Boosts
Views
Activity
I have updated to 18.1 developer beta and still same issue. I found out, that when I disable 5G option and set it to just use LTE everything seems to be working fine. also on the move, handshake between cell stations is working, even while in a call, I do not get disconnected while on the move. Maybe that also helps you until Apple fixes it with a new release.