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After first checking the main plumbing stack for an obstruction I found the cause of the problem. I had lifted the toilet off the floor and noticed that the cast iron drain pipe connected to the toilet flange had a "sludgy" deposit on the inside of the pipe. The deposit had effectively reduced the 3" diameter pipe to a 1" diamter.
I hired a plumber who used a power auger to clean the main stack and drain right out to the sewer. That was about three months ago and I haven't had another problem since.
Glad you got it cleared.