Dracaena Marginata (pics)

Hi, can anyone tell what the problem is with my plant....I can narrow it down to over watering or nutes. I feed it Guano sometimes.
Had been really really lush and growing good. In the last 2 weeks it has started with these brown yellow dots and browning at the tips, and some newer tips.
It is a dracaena marginata
any help would be great
thanks

palms are tricky,but if u flush them and leave it alone for a month and give plain water,it should bounce back,and be ready for nutes again.scrape a side off of the bark and new shoots will eventually grow out.

yeah, but i will wait a week or more until i water it just to make sure, any one else have a clue what it could be, thanks

So a month later and not looking the best...



Flushed it with water but still seems sad.