*HELP* Flowering Plant suddenly drooping and not sure why *HELP*

I agree with @The8thChevron it looks like lack of air to the roots, I have seen this happen also when the root temps are too high again causing a lack of oxygen to the root zone. I would be surprised if that is feed related.

Just read you comments. An increase in pH is usually accompanied by a drop in EC in this case you can increase your EC. If your EC is holding but your pH is slipping, you're at the right EC but perhaps have the wrong nutrient balance. If EC and pH are rising you need to raise your EC slightly and readjust your nute mix. This is a weird one that doesn't happen often but it means your plant is leaching nutes back into the res. Thats why you raise EC slightly even though it's already rising.

Almost looks like your air pump died. I'm willing to bet that you already fixed your problem. Make sure you have no root rot and use hydroguard or something similar if you're not already. In the future, go to the diary with the plant and ask the question from there. I think I found the right diary, but I'm not 100% I picked the right one.

@ChitownCannaChica Water temp is around 20c - but no different to how it always is.

What’s the water temp?

Ph was very high, however yesterday I fixed that. The res tank was quite dirty, however never had any issues like this before. All new nutrient solution and same issue. PPM is now 600 and PH is 6.2. I have shaded the plant as well