Hand augers can be "fussy"............... If you treat them like fragile glass, the blades can last 3-5 years without resharpening. One ding on the ice or even just leaning on it can dull the blades enough to create the symptoms you describe.
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Even when too dull to cut ice those blades are incredibly sharp. Handle with care, the use of gloves for removal and installation is recommended if you are new to that.
You have a few options:
1.) Get a new set of blades (recommended)
2.) Have your old blades resharpened. You should do this anyway. Then you will always have a spare, sharp set to use if you go dull again..
3.) Strikemaster has a blade swap/sharpening service.
4.) Our local tool sharpening guy does a fine job on all sorts of auger blades: hand, power, chipper, Mora, or Lazer
Good luck............
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/m