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How to fix: MacOS keep asking passphrase for ssh key after upgrade or reboots

I recently upgraded my MacOS Sierra and now ssh command keep asking for passphrase as follows when I try to login to my remote Linux/Unix server:
      Enter passphrase for key ‘/Users/vivek/.ssh/id_ed25519’:
How do I fix MacOS Sierra upgrade that keep breaking ssh keys in terminal?
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How to upgrade OpenSSH 7.0 to 7.2 on a OpenBSD Unix and Linux

OpenSSH version 7.2 has been released. How do I install or upgrade my existing OpenSSH version to 7.2 on a OpenBSD unix operating system?
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Linux / Unix: OpenSSH Multiplexer To Speed Up OpenSSH Connections

How can I multiplex SSH sessions by setting up a master session and then having subsequent sessions go through the master to speed up my ssh connection on a Linux or Unix-like operating systems?
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OpenSSH Config File Examples

How do I create and setup an OpenSSH config file to create shortcuts for servers I frequently access under Linux or Unix desktop operating systems?
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How To Reuse SSH Connection To Speed Up Remote Login Process Using Multiplexing

How do I reuse same ssh connection (Multiplexing) to speed up remote login procedure with OpenSSH client?
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