The Pixel 6a had difficulties with mobile data right from the start. The triangle with the exclamation mark in the corner appeared more often. in the underground shaft OK, but not in the open air in the middle of the city. Messages are sent randomly after a long wait. Even a call only works by chance sometimes and not other times. Then it says: "There is no mobile network available. Establish an internet connection to make a call". The data volume is not limited, updates are up to date and I use the D1 network... What can this be?