Originally Posted by kevs
Darn, right after everything seems stabilized, this today.

But no cables, what referencing? its internal HD.?

https://imgur.com/a/Lgf1RRg

It is definitely referencing your internal boot drive.

Every time a packet of data is transferred between devices, a CRC is performed on the received packet to be sure it didn't get garbled in transit. If the check fails, the packet is resent again and again until it is received correctly. There are a few CRC failures, but in this case, enough have occurred to exceed the limits set by the engineers that developed the drive. As DriveDX said, "that can dramatically reduce transmission speed and therefore system performance". With external devices, this would most likely be a failing port or connector cable. In the case of the interior drive on an Intel Mac, the internal drive is connected via a ribbon cable. In this case, the high CRC failure rate could be the result of a failing ribbon cable, ribbon cable connector, or in the drive itself.

My advice would be:

IF YOU HAVE APPLECARE COVERAGE:
  1. Be sure you have a good backup or clone
  2. get an appointment with the Genius Bar at your friendly neighborhood Apple Store
  3. Let them perform a thorough analysis and make repairs based on what they find


IF YOU DON'T HAVE APPLECARE COVERAGE:
  1. Be sure you have a good backup or clone.
  2. Consider getting an Apple Card (You can buy Apple products and pay them out in twelve monthly installments at zero percent interest if you have an Apple Card)
  3. move your plans to upgrade your Mac from someday to NOW!

If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein