OK Don, now we are getting some place. There seems to be a particle blockage in the toilet and you can try to dislodge it with a “Closet Auger”
This is nothing more than a hand cranked snake used strictly for toilet stoppages.
The problem with a plunger is most folks try to push the plunger down trying to force the stoppage down instead of using a plumber like a suction cup retrieving the obstacle.
If you continue having this problem call a licensed plumber to auger this toilet with a large retrieving head auger.
If all else fails you may have to replace this toilet. Some toilets just never work properly.
I removed several new American standard and Kohler toilets recently that seemed prone to stoppages. Please keep me posted and good luck