skimis

I have a 2020 Sierra and have a similar problem. Every time I start the truck, a different group of contact is missing. It is always one or more sequences of contacts in order by last name. Gave the truck to my dealer for a week, they installed the latest updates but I still have the same problem. I called Apple and they have been very patient - got to the point that the engineers are working on it and took logs from my phone and had me try several things. Today they called me and said that "a lot of people are having the same problem - they don't have a solution but are working on it." If I get any updates or a solution I'll post here.