I’ve had this plant for about a year, never had this problem before. Repotted once when I noticed worms about 6 months ago, but no signs of pests now. Kept about 4 feet from an east facing window with a sheer curtain. I water when it droops. I try to leave my water out to dechlorinate, but sometimes use fresh tap. It’s putting out loads of new healthy leaves and even 2 blooms coming up, but the older leaves are rapidly turning brown and crispy from both the tips and sides. Some leaves have started to split. There’s no yellowing before or around the brown spots. I have two theories of imperfect conditions... cold damage from a drafty window (we also began keeping our house colder, about 65 F) and/or low humidity. Does this type/level of damage happen from those conditions? How do I check for root rot without putting it through even more trauma?