I had a similar situation once before. The toilet would clog, I’d auger it clear, only to have it clog again in a day or so. I finally pulled the toilet to check and found a net of dental floss snagged across the top of the flange. When solids went through the toilet they would not go through the net, then I would break things up with the auger, and it was clear in that liquids would go through. But next dump and we have a clog again. Never flush dental floss.
Tree roots can also give the same symptoms. Liquids flow and the line seems clear, but solids will back up until dissolved.
Good luck.