Anyone seen a sudden change in app rankings

[soch]

We have most of our apps in navigation category. Our apps were in top 25 fro almost a year until Sep 2012. Then the downfall began we were dropped to 75-100 ranking. Now from last a few weeks, I have seen that many top ranking apps( which were not good anyways) are no more in top 100 in navigation category. Our apps have also comeback and have started ranking higher between (25-50).

Has anyone seen this behavior? Apple is changing its search algorithm back to what it had initially? Any thoughts?

 

[TouchMint.com]

Apple constant changes their search ranking system. Search rankings can be dependent on tons of things (total sales, weekly sales, price, reviews, ratings, 4inch screen size, universal, free or not free, etc..)

They constantly change it and theres nothing you can do about it. If you manage to figure it out before others you can take advantage of it.

I assume with the 5s coming out soon apps that do not take advantage of the 4inch screen will get a huge drop. Apple wants people to buy upgrades for the new phone and if none of those apps are on the top it ruins some of the incentive to do so.

 

[Twimfy]

My apps are up and down like a yoyo at the moment and the sales stats don't reflect their positions at all.