No need to disturb the soil, coffee is shallow rooted.

Collapse usually indicates root problems, over/under watering or disease.

Is this an indoor plant, or does your climate enable you to grow it in the ground?

I've grown coffee in a cold climate in a greenhouse and had beans produced.

We probably need more info.

There is a houseplant forum on this site.

Coffee likes an evenly moist, but at the same time well draining soil when grown in a pot. As the pot is watered, water should be draining. I assume there are holes in the bottom of the pot. Letting the soil get very dry, or conversely very wet, can cause root damage and the symptoms your plant shows. In your climate, the plant should receive shade during the hottest part of the day. Heat shouldn't be a problem if grown under the right conditions.

it looks like you have dirt in a pot ...

can you get a media.. and can you tune it to trees.. which usually prefer a drink of water.. with full drainage.. and near drying in between ...

i am pretty sure you already know this on some level.. with your comment about plowing the soil ... you also have salts accumulating on the edge of the soil.. which further indicates improper drainage ...

roots need air.. as much as they need water ... somehow.. your soil is out of balance in regard to such ...

ken