My iMac freezes and sometimes shuts down on its own. Any suggestion on how to fix this? Thanks.

My iMac freezes and sometimes shuts down on its own. Any suggestion on how to fix this? Thanks.

Might want to run the Apple Hardware Test just in case.
Intel-based Macs: Using Apple Hardware Test
If the hardware checks out ok the startup disk may need repairing.
Follow the instructions for Using Disk Utility to verify or repair disks

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