Yeah I've had some of the same stories here.
I bought some Ameraucanas about a month ago. Well it took a few weeks and the buff and RIR started laying and now lay faithfully. This was after I took the mean black one out. She was picking on the other two. Anyway the black one is with another rooster as a pair. She laid one blue egg out free ranging. Since I didn't find it right away and decided I didn't want to easter egg hunt for the eggs, I decided to keep her up. She has not laid another egg since!
My blue hens have been here a little shorter time than the Ameraucanas. About 3 weeks or more though. I have 3 of them. First day got 2 eggs, second day 3 and then just 1 from then on. Two stopped laying altogether, the third lays about every 3 days and takes a day off. She actually laid yesterday which was her 4th day in a row though. I'm waiting on the others to start back up.