If an app freezes or quits unexpectedly on Mac
When an app on your Mac stops working, try these suggestions.
If the app is frozen and unresponsive, choose Apple menu > Force Quit, select the app in the dialog that appears, then click Force Quit. You may lose unsaved changes.
If the app quit, reopen it by clicking Reopen in the dialog that appears.
Restart your Mac by choosing Apple menu > Restart.
Check the app’s documentation to see whether it’s compatible with your version of macOS.
Open another file in the app. There may be a problem with the original file.
Check for updates to your software.
Disconnect any peripheral devices you just connected (for example, a printer). They may not be compatible with your version of macOS.
Uninstall any app plug-ins or enhancements from other manufacturers.
If you recently updated the app or macOS, a plug-in or enhancement you installed may no longer be compatible.
Use Apple Diagnostics on your Mac to learn whether hardware you installed, such as additional memory, is incompatible, improperly installed, or defective.