Unplug the tool and try and rotate the spindle/blade by hand by using a glove on the blade. Does it move freely or is it tight? Then did you recently remove the blade and is the inner flange on? If it doesn't move freely I would remove the back motor housing cover to check the bearing condition and look for any obvious visible problems like discoloration of the field/armature. please let me know if you need more assistance before voting. Thank you
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