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Because it is an ash tree, I would recommend having an arborist out to see it immediately. Emerald Ash Borer has become a serious pest in the US over the past few years and threatens to wipe out ash trees in the US. The tree needs to be checked for this pest and, if infected, will need to be removed and destroyed.

It may just be a fungus, and the tree will only just need a treatment of fungicide, but the Emerald Ash Borer is such a serious pest, that you need to have a professional on site to look at the tree and determine the cause of the issue.

What is happening to them is a lot like transplant shock, so this article will help: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

Continual suckers indicate the tree feels it is stressed. Is there something in its environment stressing it? If this is the case, correcting that stress will stop the suckers.

Pinpointing the exact type of fungus that is affecting your lawn may be diffcult as there are many. Nonetheless, you will need to use a fungicide on it. This article will help: https://www.gardeningknowhow.com/lawn-care/lgen/grass-fungus.htm

I have an ash tree that did the same thing. It turned out to be tiny worms that rolled up in the leaves, the tree dripped gooey stuff and had the same thing with stuff falling on the ground. The tree looked sick. I got some Bayer Tree and Shrub granules and applied them around the base of the tree as the label instructed. Soon things cleared up. The following year I did the same application early in the spring so as to get ahead of the pests. It worked too and the tree had no problems. I do that same application each early spring now and the problems have not come back. There is a systemic insecticide in the Bayer product that keeps things under control and it feeds the tree too.

I too have an old ash tree, actually two of them. One of them had problems with some kind of worm or caterpillar that would cause the upper leaves to roll up, turn brown and die. Sometimes it dripped a slimey goo as well. I told a gentleman at our local nursery about it and asked about a spray for it. He advised me that spraying does not work so well many times, so he showed me a product called Bayer Tree & Shrub. It is a fertilizer as well as a systemic insecticide. I feed the trees with it once every year and have had no further problems. Therefore, I recommend the same to you.