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Lilac Leaves All Dead


I have a lilac tree that has been growing well for approximately 7years and had no problems with it. For the last few years I have been removing the dead flowers and light pruning once its finished flowering. This year after flowering it started with a few brown leaves. I removed the dead flowers as normal but it continued to turn the leaves brown. I went away for 3 weeks and on return all the leaves are dead but on the tree. It in a nice open space and there is no compaction of the soil. The soil has a mulch every 2 rears with a layer of home grown compost but not this year. It also gets a fertiliser feed every 2 years. I scratched away a small area of bark and it looks nice and green. There are no other outward signs.Attached are photos of the disaster.
Any help greatly appreciated.
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The trunk is fine.
A bit gnarled with age lower down but intact.
I have wondered if it was caused by the weather as we had a heatwave in the spring followed by a really cold snap for a few days. It played havoc with the hydrangea and turned the edges of the leaves on the top 6in of the bush brown and crispy but they recovered ok.
I cut it down to the ground but didn't get around to removing the stump and about a year later I noticed a shoot - about 3 years on from that it's 6ft again
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
I live in west central Scotland - not where that photo is...