Apple tree - dies back after flowering


We had two lovely old apple trees in our garden and both suffered from the same. Healthy until it flowers - and then a few days after blossom this happens.
We lost one tree, and I added another to replace it - but on the other side of the garden.
Now the same has happened to this.
I have tried washing the apple tree in winter, and lastly spraying in an attempt to solve - but my attempts to identify what is wrong are not working - and I think its time to ask for help.
Many thanks.
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