Installed an American Standard Champion 4 toilet about 2 weeks ago. Everything was working fine until today. I went in to the bathroom this evening to hear the toilet running and water all over the floor. Bowl was almost completely full. Thinking someone clogged it, I flushed it again just to check and flushed as it should, but the bowl barely filled up and then almost drained and glugged a few times. I flushed it several times and it keeps doing the same thing, flushes fine and but the bowl hardly fills up at all and what does drains out to where there is basically a dry bowl, just an inch or two of water in the exit pipe (probably a better term??). I checked the fill tube and it seem to be in the right position and water does flow out the tube into the overflow tube. Water level in tank is about 3/4" below the top of overflow tube now. It was maybe a 1/4 below when I started messing with, so I dropped the water level but still get the same result. I even dumped a couple cups of water down the overflow tube to see if it would help fill the bowl and it didn't seem to raise the water in the bowl at all. It has me confused because it was working fine for a couple weeks and then all of sudden this issues. Any ideas??

something is obstructing the trapway of the toilet.
a plunger might clear it.
if not get a good quality toilet auger to clear it.

ditto

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638