Alfred keeps asking for Contacts permission
Just like @nobody-in-particular said, your Alfred code was probably changed, therefore the signature that was in place for Alfred is no longer valid. What you have to do is sign the application after the changes to the code.

This worked for me:

sudo codesign --force --deep --sign - "/Applications/Alfred 2.app/Contents/Frameworks/Alfred Framework.framework/Versions/A/Alfred Framework"