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You have had these for quite a while so definitely something has changed.
I agree, look for copper....copper kills....is it just these corals or anything else die.
You also say Nitrate, Phosphate, Amonnia, within limits....test kits should show 0.
Mushrooms, leathers like to have a tiny amount .03 of iodide (not iodine which is not safe).
Frogspawn you can target feed..do you do this...mushrooms don't like light but leathers love light...are they placed right.
To me, 75 is a tad low....I am 78-79......and SG for a tank with corals should be 1.026.
Are you sure your 1.023? Wrong SG is actually quite common and leads to slow deaths.
Those are all the things I can think of.....good luck.....lets us know what you find..
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