What you desperately have to do is add a balanced fertilizer! Not compost or tea or fish emulsion...or epsom salts! Balanced fertilizer. Just follow directions do not add more or less than the instructions. I'd use OSMOCOTE 14-14-14, and only fertilize twice a year not 4.
Remove all the weeds around the base on the surface of the soil. Check to see the condition of the base or trunk(s). Woody shrubs will eventually die if buried too deeply; only the roots are underground, the bark of the trunk free from any mulch, weeds, soil, rocks so moisture is not allowed to stay on the bark to harbor bacteria that will girdle your trunk. Use a balanced fertilizer with N P & K. Your plant is not able to support any more leaves until it has fertilizer with which to make its own food.
Essentially, your plant is dumping photosynthetic factories. If a plant does not have access to nitrogen, phosphorous, potassium, iron, calcium, manganese, and about dozen other micro 'nutrients'...it is unable to make its own food. Your plant is starving. It's own carbohydrate storage of food can not support any more leaves and the roots are probably compromised as well. It has chosen to support just enough photosynthetic factories to survive, robbing Nitrogen from other leaves or rather mobilizing any nitrogen available to help out the failing factories left.
I think I know the brand of Laurel you have but I am not going to try to spell it without looking it up...see what you think...Prunus laurocerasus Schipkaensis See what I mean with the spelling? Schipkaensis Laurel
This is a better picture although this plant is in desperate need of fertilizer as well. See the color in the first picture? That is what your plant should look like, a bit lighter because you are in full sun but not this color. Add 'Macrophylla' which means roughly 'I have fatter leaves than my cousins'? Prunus laurocerasus Schipkaensis Macrophylla Schip Laurel
Note: Don't remove ANY leaves...yet. That plant is down to its last reserves. Those factories, the green leaves are all that are supporting this plant, making the food necessary for all functions! Without those factories you can forget about fertilizing. Fertilizer are critical chemicals those factories need to convert sunlight into food...food for the plant itself. Without factories you won't need support supplies. Don't take those factories off just yet.