Harshguy,
That's a weird one for sure.
Have you made sure there isn't something (like a washer) stuck in the motor?
I'd also check to make sure the motor rotates freely with no brushes in it. If the armature has developed a partial short in it the motor will still run but it'll pull massive amps.
If you're sure neither of the above is the problem then you can try gently scrubbing the face of the brushes on a flat surface. This will flatten the edges of the brush just a little. Sometimes the contour of brush will cause it to touch the comm only on the outer edges, this can make the motor pull a lot of current for the first minute or so during break-in. Once the brush breaks in a little and it begins to "fit" the comm better the amp draw will drop down. Scrubbing the edges flat speeds up this process.