Now in the summer

It appears to be a tropical Hibiscus that is getting too much hot sun or too much fertilizer. (or both) Hibiscus rosa sinensis.

I have hibiscus rosa sinensis but they do not get like this. The leaves are different, these have more brightness and sprout from the whole stem. There is a remarkable difference, I have 3 potted plants of these and have run out of leaves, the other hibiscus are normal.

Maritza, possibly you have a different Hibiscus...not necessarily Hibiscus rosa sinensis? The Malvaceae family is huge, numbering in the thousands so I wish you luck in ID'ing which genus your plants belong to. They are lovely and look quite healthy. :-)

could have been wilt disease. if you were treating it the same as your other tropical hibiscus - then I would be very suspicious that it either got over/under watered and got root rot... the whole plant just wilts and doesn't recover usually means fungal infection.