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Front Loading Whirlpool machine (W10891955A). When the fast spinning nearly gets to a stop, a loud grinding noise happens for a few seconds. What is it? Is it hard to fix?

Without knowing more, I would unplug the machine and remove the cover panel under the door (3 quarter inch drive hexhead sheet metal screws just at the floor, or, if the washer is on a pedestal, behind the pedestal drawer) to inspect the innards of the washer. There are 3 or four shock absorbers between the drum and the bottom or side of the washer. Grab each and make sure they aren’t broken or loose. look for any broken parts on the bottom of the washer. If everything is intact there, you will have to remove the top of the washer and check the 2 large springs on either side of the drum to see if they are broken or stretched. Instructions for removal of the top can be found online. Not that hard if you have a little mechanical ability. Parts are also available on line and are not terribly expensive. Good luck!