Q.brown leaves on ivy
In 2009 I planted a single Ivy plant on my patio. Since then it has grown beautifully up and across the stucco near the ceiling. (See pics below) So here is my question? Just the other day I noticed A LOT of brown leaves that are crunchy but don’t crumble like other plant leaves do when they are brown. How can I save my IVY? I haven’t changed anything in regards to watering etc. I haven’t seen any obvious bugs or anything…just the spots as shown below on some leaves but only a handful. Please help.

If your plant is in a pot it may need repotting and new soil.
Also if the plant gets long tendrils it may need pruning to keep the plant healthy and in good shape.
You can use a half strength fertilizer on the plant to give it some help.
Insects can sometimes be difficult to see. Spider Mites are common on Ivy.
The plant can be treated with Neem Oil as it works as both an insecticide and fungicide.
Here are some links for you.
https://www.gardeningknowhow.com/ornamental/groundcover/english-ivy/english-ivy-plant-care.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm