A few days ago my toilet started draining slow. When I flush, the toilet fills up, and then slowly drains. To get solid matter to go down I have to flush 3-5 times. I first tried a plunger, which did not work. I then tried a closet auger, which did not work. So, I disconnected the toilet and took it out. I tried the auger and made sure that the auger was getting all the way through the trap, and it was. There did not seem to be an obstruction in the toilet. So, I looked down the pipe where the toilet connected and there was no water and no obstruction that I could see. Nothing else in the house drains slowly, just this one toilet. Any suggestions? In the restroom with the slow toilet we have a shower, tub, and two sinks, none of which drain slow.

Thanks for any advice.