Might be the carbons brushes of the motor.worn out. It's a relatively easy job to repair.
See this yourtube video
How to Replace Carbon Brushes on any motor
Vintage Waring blender with bad motor brushes
Replace the Blendtec carbon brush
Where can buy brushes for my blender Blendtec Total Blender
Of course if you feel you don't have the technical knowledge to open your blender and check if ti's a "carbon-brush" failure, you should take it to a repair service
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