Contacts App and spinning ball of death

Boot into Safe Mode according to Start up your Mac in safe mode - Apple Support and see if the problem persists. Reboot normally and check again.

NOTE: Safe Mode boot can take up to 10 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

I don't see any of the usual suspects. However, you haven't rebooted your laptop for over 9 days.

It's beneficial to the system and applications performances to reboot more frequently, at least 2-3 time per week. With a SSD drive rebooting should only take 30 second of less. Rebooting clears out temporary system and application cache and swap files.

Make your first reboot one into Safe Mode by booting with the Shift key held down.  Then immediately reboot normally.

NOTE:  if you have a wireless keyboard with rechargeable batteries you should connect it with its charging cable to assure a boot into Safe Mode. 

Download and run Etrecheck. Etrecheck is a diagnostic tool that was developed by one of the most respected users here in the ASC and recommended by Apple Support  to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.

IMPORTANT:

Before running Etrecheck assign Full Disk Access to Etrecheck in the Etrecheck's Privacy preference pane so that it can get additional information from the Console and log files for the report:

Also click and read the About info to further permit full disk access.

Copy the report

and use the Additional Text button to include the report in your reply.

Then we can examine the report and see if we can determine what might be causing the problem.