Rock just stopped playing and restarted by itself?

Please find a day when you don’t listen to music, and run this memory test (free edition) for no less than 24 hours:

You may need to adjust BIOS option for UEFI before you can boot it, and revert it to go back to ROCK.

If you are unable to boot the above no matter what, there is another alternative:
https://www.memtest.org/

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