Lawn dying - need help!

Hi everyone,

my lawn has been a battle since we move in three years ago.

When we moved in there were bare patches in several places which I reseeded but then every summer more pop up.

ive been feeding year round, have scarified, top dressed, overseeded and even aerated and this keeps happening. Even with all the rain it’s very patchy and dead in places.

It’s gets back to being lush and green then come summer dies off again.

Pics attached as of today.

Any ideas? Is it fungus?

 

It looks like a fungal problem to me.
Have a look at Fusarium patch online.