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I've been having this same problem. Glad I found your post. Didn't realize it had been happening since April until I saw you checked your trash and so I checked mine. 400+ contacts total deleted a few at a time daily since April 28th. But there were only like 50 deleted from Google after the first deletion from Samsung contacts so its clearly Samsung deleting contacts.
If you want Samsung to help.
Right after the issue appears, please submit an Error Report. Samsung Members app->Get Help->Feedback->Error Reports
Which phone part number?
I can't help, don't have the issue and haven't really seen the multiple contacts issue before. Most deleted contacts that have been reported ended up just being dups sent to trash.
Galaxy S21 Ultra 512g(VZW), Galaxy Book (original, VZW), Tab S8 Ultra, Tab S4, Galaxy Watch5Pro(VZW), M8 Smart Monitor