Hey Quest,
Have you seen any pest activity...like anything actually flying around like a fungus gnat? You could try turning over the leaves and scouting the bottoms and the soil just in case.
But with the leaves i see some have turned up edges and tips of the leaves...i think you should maybe consider heat spots(sometimes the leaf surface temp is a lot higher than the room temp, i bought a thermal gun with the lazer to check that, they're cheap and helpful). Otherwise double check your roots are happy...no smells, dark roots popping out of the pot, etc. Possibly do a mild plain ph'd water flush..nothing drastic but just a clean out and add some mycorrhizal fungi to help bring the soil back to life and strong.
Happy growing.✌️