

those discolored catalaxts indicates that your plants branch is dead or dying , mine will do the same in a bit. Careful not to over dry when you dry she's already drying out it seems.
The bud falling off is a mystery to me ... could be your grow was missing an essential nutrient, no idea what ... your pics look good and show a plant that is nearing completion ... I'd switch to plain water from here out and if you want you can harvest the branches/buds that are most mature first and start them to drying ...
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I`d harvest the tops and see how the lower growth develops for a week or two (I`m not growing under lights atm though!). Have you checked the trics?