Hi,
I came across your thread, and am facing a similar problem with my monstera as well. I have bought it about 3 months back, and 1 month in, I reported it to a bigger pot with compost soil.
I was watering it about once every 5 days making sure I don't over water it. Once a month I do give it fertiliser to promote growth. It was growing well with about 4 new shoots since I've gotten it.
However, there has been yellow/brown spots appearing. And initially only 2 or 3 leaves have them. But now, those 2 or 3 leaves have gotten much worse with a few others having small areas with spots.
When wiped, these spots seem to be spores on the underside and comes off rather easily. It however comes back after awhile.
I thought things would be okay as Long as new shoots come out, and I cut the infected ones later in the stage. However, recently the leaves seems to be drying. And the most heartbreaking was that the newest leaf had brown or dark spots that seems like they were burnt. The tips of the leaves too! And this burnt tip is happening to another leaf as well.
I'm hoping I can save the plant but I need help!!
To provide a clearer picture, please see the photos below.
Hoping you can assist and save my monstera! Thank you!