Are "feed" Backlinks an issue? - Vigorous Fickle in the rankings in past two months

[Ishrat-Khan]

Hi All!

I have been observing a vigorous fickle in my rankings since past two months. Some first page keywords have moved to the second page.

Some of my observations from the backlink audit rose below questions:

Q1. Are large # of backlinks from "feed URLs" harmful in any way? If yes?
Q2. Am I supposed to get webmasters take these down or block their own feed URL?
Q3. The backlinks come in huge numbers from reliable websites. Do I need to remove the backlinks just because of the huge number?
Q4. What factors to look for if rankings started fluctuating in past 2 months?

Note: these backlinks from "feed" are from the websites who posted our editorials.

Backlink Example: http://xyz.com/categories/abc/feed/