Our Acer is very happy where it is and gives a brilliant show.It’s a bit early for an Acer to go to it’s Autumn tint I did have a problem with my Acers losing the leaves but this was due to being exposed to drying winds Moved them to more sheltered spot .Now they keep the leaves till mid October
However the leaves have turned dull green/brown colour. Looks healthy but lost its vibrant colour.
TBH I cant recall its normal cycle.