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I have seen a 20% drop in traffic from google last week (After April 29th). However when I try to analyze the rank of the keywords in the google results that send me traffic they seem to be the same.

Today (6th March) Traffic has fallen further again with not much/any visible change in the rankings. Any ideas on what the reason for this could be?

I have not made any changes to the website recently.

I run a product search website for the Engineering Sector. Each of the companies listed on the website has a profile page. This page used to rank very well in google.

Over the last couple of weeks these pages disappeared for google i.e they fell about 20 to 30 spots in the search results for relevant keywords like the Manufacturer Name.

I was trying to analyze the page and found that Each of the Categories that the manufacturer supports was listed in "bold" and linked to the page for that category. A manufacturer can support up to 20 or 30 categories so this results in about 20 or 30 Bold keywords. Is this a bad practice? Could this be a reason for a drop in ranking or do bold keywords on a page not matter?

What are your views?

I have asked a partner website to link to my website in the Menu Bar. Which has resulted in a link to my website from every page of the partners website (Over 1000 Pages). The link is not a "nofollow" link, it is a regular link.

Can this have any negative effects in terms of SEO?