Not sure if this is a "live with it" problem (or two) or a "need to fix" problem so I need to ask: What is likely causing these symptoms and are they a critical fix set of symptoms or are they "old age/high mileage" quirks? It has no "check engine" light on. I'm unsure if my cheap-ish OBD-II unit can check for the problem.

My car, a 2016 Corolla LE CVT with 130k mi, has recently started "running funny", in short. I have noticed a couple things that showed up at once.
1) It idles 200-300rpm higher when coasting at >~10 but <~25 mph almost exclusively (used to be ~1100rpm, now ~1400). It revs up 200rpm when I let off the throttle instead of "idling" down to ~1100rpm as previously. It's quite a bit pushier and harder to stop than before as a result but still plenty doable.
2) I have also noticed it clunks when accelerating, only after coasting, on flat ground or downhill slightly (most noticeable when feathering the throttle). Not a loud clunk, but very distinctly a clunk and not every time. Only when going straight as well, it does not clunk when turning and accelerating. Since it showed up at the same time, I suspect it may be related.
I have cleaned the MAF sensor in response to these symptoms but little has changed besides it running a bit smoother.
Bit of a mess of stuff all at once, but the sudden change has me concerned. Any ideas what is happening?