Help me fix my Toto Drake

My Toto drake is about 2 years old now. I installed it myself. But over the past 2 months it seems like I need to take a plunger to it almost every time more than 3 wads of toilet paper are used... Thoughts on how to troubleshoot this? Water levels seem OK... It flushes great otherwise, just gets stuck with 4 or more wads of toilet paper. Upstairs toto drake (same model) can handle 4 or more wads of toilet paper without ever needing to be plunged.

There may be something in the lower trapway that is hanging things up.

Sometimes, it's a good idea to hold the handle down to drain the entire tank, just to sweep the trapway.
Anything left over in the trapway can impede the siphon action.

Thanks, I will give that a try and hopefully it will do better. It's been a great toilet otherwise that I bought and installed from finding your site.