Preview freezes every time I restart it and open a file
As a troubleshooting step I would boot your Mac into Safe Mode.

Boot into Safe Mode

Follow these steps to boot your Mac into Safe Mode:


Fully shut down your Mac
Restart your Mac
Immediately press the Shift key and keep it down 
Let go of the Shift key when you see the login window (NOTE: If you have FileVault enabled you may need to log in twice).
Take a note of what happens (i.e. use Preview a couple of times or so to test it)
Exit Safe Mode by restarting your Mac as normal
Log in and test Preview again


Let me know how you go.