When you went to File>Options>Customize Ribbon>Keyboard Shortcuts, was the 'Reset All' button greyed out? If not, that means one or more default Keyboard Shortcuts have been re-assigned. Clicking the 'Reset All' button will restore them to their defaults.
The fact pressing Alt-x freezes the cursor suggests some sort of conflict is occurring, perhaps with a 3rd-party addin. You might try starting Word in safe mode to see if the problem goes away; if it does, an addin is the most likely culprit.
Alt 8531 vs 2153 Alt,x, 8531 is just the decimal equivalent of Hex 2153, so you're getting the same character either way.
As for your frequent use of symbols, you might consider assigning the most-frequently used ones to keyboard shortcuts of their own.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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