all plants shed old leaves...

we usually prune them off when they start looking ratty... as they are the oldest.. lowest on the trunk ...

can you tell.. in person.. if the worst are the lowest.. if so.. cut them off ...

what does the newest look like.. is it fine.. thats the key to its current happiness.. if you will ...

the browning MIGHt also be lack of proper watering.. when is the last time the plant has been repotted.. media is a water management system.. and it wears out.. and when it does.. it is hard to water properly ... also.. that looks like a lot of plant for what might now be a small pot...

it looks like some of your trunks are getting long.. i might try rotting some of them.. and starting new plants... this old thing isnt going to be happy forever.. since you dont live in a green house..

lack of proper light is called etoliation.. and that might be why some of your trunks are getting long...

ken

Hi Ken, 

As mentioned, we changed the soil about a month ago. 

As for the dry patches seen on the first 2 pics, they are on all leaves. The brown edges don't appear on all (yet :/), rather i would say on the older ones, but at this point 60% of the leaves are brown on the edges. The rest "only" has those yellow patches all over the surface of the leaf.

The room is south-south-west, really light. The plant is not in direct sunlight but about 5m from the windows. It's the same place it has been in for the past 4 years. Yeah, might get long a bit, but is this the reason for the yellow patches?

Hi Ken, 

As mentioned, we changed the soil about a month ago. 

As for the dry patches seen on the first 2 pics, they are on all leaves. The brown edges don't appear on all (yet :/), rather i would say on the older ones, but at this point 60% of the leaves are brown on the edges. The rest "only" has those yellow patches all over the surface of the leaf.

The room is south-south-west, really light. The plant is not in direct sunlight but about 5m from the windows. It's the same place it has been in for the past 4 years. Yeah, might get long a bit, but is this the reason for the yellow patches?

Hi Ken, 

As mentioned, we changed the soil about a month ago. 

As for the dry patches seen on the first 2 pics, they are on all leaves. The brown edges don't appear on all (yet :/), rather i would say on the older ones, but at this point 60% of the leaves are brown on the edges. The rest "only" has those yellow patches all over the surface of the leaf.

The room is south-south-west, really light. The plant is not in direct sunlight but about 5m from the windows. It's the same place it has been in for the past 4 years. Yeah, might get long a bit, but is this the reason for the yellow patches?

It’s rare on Monstera deliciosa, but it might be thrips.

Apparently neem oil didnt improve things much, though :(

Have you tried misting the leaves regularly? It might help bring some more moisture back into those dry patches. It could also literally just be the position - if you haven't moved it lately, it could need to be in a bit more light! Any chance you could move it into a brighter spot for a while to see if it helps?

I put a humidifier next to it that i  try to remember to switch on regularly. Unfortunately cannot move it any closer to the window because it's a big plant and i don't have enough space. But i'm wondering how it was enough light for it for 2-3 years, and suddenly not anymore..