My mazda protege has the o/d off light flashing!!!?

Ok so the car is shifting really smooth..when i change from parking to retro or drive the car will jump, this only happens when the car is cold. When is normal it works perfectly.
The light sometimes goes off it stop flashing and it comes again.
And also when i press the o/d button the On the the car will accelarate and when i turn it off it will go down.thanks
 
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