Day 56 Autoflower question/problem.

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Ok, I have some questions about my Diesel Ryders (first grow) that im hoping someone can help me with. No pics today as im late in from work and dont want to deal with it at the moment
But i will describe the problem,
They will be hitting Day 58 Tommorow and are an autoflowering strain they have been in flower for weeks and the buds look quite nice (there are pics from a week or so ago available in a thread i have on the grow journal) but now im starting to wonder about when to harvest as all three plants are showing the same signs/problems?
The main cola and the majority of the leaves are healthy green and very sticky but there are some leaves, including leaves growing out from the bud that are now dying, not wilting away like previous leaves but crisping up from the tip and spreading towards the stem, i have noticed that some of the leaves are actually healthy and sticky and covered with hairs on one half, but crisp and well.. dead on the other half. I can rule out both nute burn and heat stress or over/under watering as I have encountered and overcome all of those problems so far. So its something new.
So anyone got any ideas?

PS
Sorry for the long post, I should just of done the pictures

have you check for bud rot i had my leaves tip near the buds turn rusty looking and it turned out to be bud rot!im prob wrong as im new to this but have a look for mold just incase! better safe then sorry!

Thanks for the reply, but from what I have read, bud rot starts with the leaf dying at the stem outwards until it reaches the tip of the leaves, mine seem to be fading from the tip towards the middle of the leaves. But only some leaves the vast majority are completely healthy, but there are enough of these crispy dead ones to make me wonder whats happening.

mine def started from the tip inward and i didnt kno what it was for a few days then had a closer look and notice some white fuzziness and decided to give it the chop and found the budrot! hopefully its not and you can sort it out good look growing!

Well you got me worried so i went and checked on them (its daytime in there world so its ok). The insides of the stem seem to be ok, but I relented and got some pics while I was there.

Bumping this as I have added pics now.