Ads change after having great days :(

[security56]

Just wondering if this a normal thing with Adsense. I notice that everytime I have a great day, ads change to what I believe to be the lowest paying ads. It has happen several times. Each time I tweak the site a little to get backs ads with higher value, And it happen again :).

[Bonusbana]

Happened to me too. I am getting used to build new start pages ever now and then.

[security56]

:) yeps its lots of work, always updating when this type of thing happens, The only reasons I can think of why this would happen is.
1-The advertiser run out of budget.
2-Google don't like me making money :)