I got this plant about a year ago and it has grown a lot since then with multiple new leaves. There was a period where I discovered I had been over-watering it about 5 or 6 months ago because I got really bad fungus gnats. I ended up having to repot and cut back some foliage but it was time to repot anyway. About a month or two ago, I started noticing a couple of the older leaves at the bottom started turning brown/yellow on their underside and it has now progressed to multiple leaves and I’m getting worried. I hadn’t fertilized in a while so I thought that was maybe the problem but that has’t fixed anything. I’ve been using a moisture meter to make sure I don’t water before the soil has dried out so I don’t think I’m overwatering but who knows at this point. Has anybody seen this before or have any clue how to fix it?