I'm not sure what's going on with my ZZ plant. I have a few of these and they all look pretty good, except for this one I noticed about 3 weeks ago looking sad. I think I over-neglected it. I watered it and it perked up some but it still looks like an unhappy plant. I've had it probably a year and a half now and I've never repotted it. I've always heard "neglect, neglect, neglect" with these plants so the "fix" always seems to be water less, neglect more, but I don't think that's the problem here. I water my ZZs maybe every other month in the winter. The leaves look curled under and the stems are leggy and overall it just doesn't look happy. Could it be seasonal?