Steering Wheel Shakes Stops Shakes At High Speed?

I Have a 2004 Honda CRV i bought brand new tires for and they drove perfectly fine and smooth

later that night i got a puncture and a flat tire which i fixed with a plug kit with no leaks

the next day when i sped up to 65 miles an hour the steering wheel will shake a little for half a second then stop for a second then shake again over and over

the faster i go over 65 the shake stop gets faster

and under 65 it drives smooth as glass

Is this a major concern?

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