My Mac deletes contacts from my Contact list. Why?

There is your problem, Avira!

Avira is considered malware by most experienced users on these forums! Mac OS is catlike in that it cleans itself, Mac OS does not benefit from nor does it require any of the following types of apps:

·      Antivirus Apps

·      Cleaning Apps

·      Security Apps

·      VPN Apps

·      Maintenance Apps

What these types of apps do is the exact opposite of what users want. They make Mac OS slow, appear buggy (begining to sound familiar?), can damage Mac OS and sometimes create unwanted behaviors. In short, they are really bad news!

So the first order of business for your computer is that you need to locate the developers. uninstall instructions for Aviraand please uninstall Avira. Because Avirais pretty nasty stuff it tends to leave parts behind after being uninstalled, a testimony to how poorly written the app is! To fully ensure you have uninstalled it please download the free version of FindAnyFile directly from the developer. Then have it search your system for the following:

·      Avira

Have it Trash any files with those names in them and then ensure the Trash is empty. I strongly suspect after fully ridding your system of Avira that it will return to normal behavior. Moving forward, in order to keep your Mac secure and running well simply keep Mac OS up-to-date and restart the computer about 1x per week, other than that please leave Mac OS alone!!

What makes you think your Mac is intentionally doing anything at all?

It does not have a mind of its own. it will not spontaneously delete contacts.

Are you sharing an ID with anyone? What cloud service are you syncing your contacts with?

+1 on Kilted Tim's post.

BTW, do you have any of the following third party apps installed on your Mac?

·      Antivirus Apps

·      Cleaning Apps

·      Security Apps

·      VPN Apps

·      Maintenance Apps

joncile wrote:

Despite your criticism, the computer is deleting my contacts on its own. If you are going to reply to a question, try being helpful next time.

Your computer does not have free will. It is a machine. It doesn't do anything on its own. Since you're unwilling to provide any actual information that would be useful in troubleshooting, I have to assume you not actually interested in solving your problem.