Footnotes, endnotes and links

[Sissinghurst]

Hi, two separate problems here connected with footnotes/endnotes.

1) I have a couple of documents where the footnotes don't have any links at all. Is there a quick way of getting this done in Calibre?

2) In some books, the link to an endnote always goes to the one after it's supposed to. (This is when the book is on a mobi on Kindle.) Yet if you click on the endnote to go back into the text, it goes to the right place.
e.g. In the text, you click 54. You are shown or linked to endnote 55. But within the endnotes, you click on 54, and you go back to 54 in the text. Is there a quick way to sort this out?