dab, you seem to be a nice guy, you also seem to be a exp grower. from a outside look in you also seem to bet set in your grow routine (7yrs),maybe a bit stubborn.what I got from your post,was that you have been doing this same routine for 7 yrs and have been plauged with this sudden death syndrome. So I reccomend you step out that comfy box and try a new approach,it is the only way to find out what is causing it.(repeating the same action and expecting different results) we all no what that means(insanity).
did you say your using GH soil nutes in Hydro? maybe try a new nutes solution,something thats a bit more tolerent? (forgiving). like I said I'm a noobi and I believe you'll need to try something new to fix this. Your routine has a Flaw,find it too fix or find a whole new routine? open your mind
I have bad memory so my posts are kinda jumbled @ times srry
gtg I've fried my girls they are dying !!! looks to be a funeral soon