I noticed around a month or so ago on my wordpress blog, I have a website in google news and I used to be able to see ads almost immediately once I published a new article, now I post an article and all the ad spots are blank

Ill go back 20 to 30 minutes later and the ads will show up

This also happens to old archived articles, if I never visited the article the ads wont show up, I checked some articles on the article archives from 2011 and I clicked them and the adsense spots were all blank, I came back again later to the same article and the ads show up

This hurts me big time, I have just started focusing again on my google news blog it deals with a niche its not general news but on a single sport.

I rely on posting up to date articles in news so the first 30 minutes is important for ad revenue, that's usually when articles are freshest so if people are visiting my article for the first 30 to 40 minutes im not receiving any income because of the blank spots, thats when people usually receive most income

Google news constantly changes positions for articles

I had 200 visits yesterday but only made 15 cents one click, and the day before that I had 300 visits and made 85 cents from two clicks

I read on other sites that people were having the same issue and it never resolved. I am not blocking google bot from robots txt either its pretty much the same one ive been using

only thing I can think of is maybe some plug in doing this? but I dont know since others have been reporting something similar.

Anyone experience something similar and were you able to fix it?