AddressBookSourceSync runs continuously.

Address Book is fully populated. If I kill the Sync, the Address Book is Empty. The Sync uses 99.4+ %CPU. Everything, including loading internet pages, slows down.

I have expunged duplicates and anything that looks like an error so the file is clean. Only valid, non-duplicate cards are in the book. This Sync is iCloud related. iCloud is the real problem as it is always deleting some files (such as these.) for no reason, but all kinds of things disappear if you turn it off.

I have found "solutions" for this problem, but all of them are for older versions of the OS and things come and go into/from the system so I cannot follow them.

Any ideas how to fix this sync in today's (9/24/24) Seq. 15.0 OS?