What's going on with this plant

I have this girl here she is in week 7 of bloom and the buds seem to be fine I have been checking for bud rot and I don't see any problems with the he buds the leaves are dying off . I'm using Advanced nutrients and it seems.s like everything is doing ok Except for the leaves dying. I Thought it was Cal mag deficiency but that's not it I checked ppm and they are perfect I just never seen the leaves die like that I've only been growing for 2 years I just can't figure it out maybe someone has any idea what's wrong or is it normal thank you in advance for any help

Advanced Nutrients has several products, we need more details on your grow. When you checked PPM, what are the numbers from the readings? Have you checked pH? What are you growing in? Have you successfully used this same routine and products for past grows and harvests?

I'm growing in coco and perlite 70/30 with . Extreme micro. I'm using ph perfect connoisseur bloom and bud Factor x with I have overdrive that I haven't used yet and Flawless finish for the end. I have used almost all the different. Nutrients and advanced nutrients gives me the best Results the ppm was at 1100 when I checked it or 110 if you read it that way

Looks like a lockout or salt toxicity. I presume your 1100 PPM is the nutrient PPM. Have you measured runoff PPMs? You're mixing your nutrients with RO water?

I haven't personally grown in coco, I know it has some differences from potting mix. I've read you're supposed to water drain to waste to mitigate salt build up. That's how you water?

I'd probably also want to check coco's pH with a slurry test.

Perhaps someone else with more coco experience will chime in. Good luck!

Thank you that helped me a great deal I never thought about salt Toxicity I will check the pH with a Slurry .but you really have thinking about the salt buildup. thank you