Google Suddenly Not Indexing New Content - Any Ideas?

Hi everyone,

First of all - I've been a fan for a while, but just recently a member.

I've noticed Google has slowed down significantly indexing my website. I have a number of new posts that aren't being indexed, and even after submitting a sitemap - Google won't index certain pages of my Wordpress site.

About a week ago, anything I posted was indexed the next day and was usually very high ranking. Now it's all changed.

I've checked the ins and outs of my site to make sure I don't have some strange problem, but I can't find anything.

I've noticed many of my competition websites are coming up within hours or posting new content, and I'm nowhere to be found. I even tried submitted a sitemap to Google, and it took 2 days for them to process - and even still they didn't index the important new pages, only the less important stuff.

Here is an example page I'm trying to have Google index: AVASoft Antivirus Professional Virus (Step by Step Removal Guide)

My concerns:
- Is it because I use the same removal guide template for most of my guides? (Not enough unique content) I try to post as much information at the top of each virus removal guide as possible.
- Is it because I'm using affiliate links for virus removal tools/software?

Maybe it's just a glitch? Maybe I need to open a beer and calm down