That's called chine walk.
You are getting too high out of the water. Might have to trim down some. Or your motor is not straight on the transom.
You will need to make small steering adjustments to keep the boat from chine walking.
If it starts, just make a very tiny adjustment to the left, then again straight. This changes the torque push that is making your stern move around. Don't make big steering adjustments. It will make it worse.
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