Just my observation with my sites... when you launch a new site with to many pages google will index it very fast but soon will deindex them slowly. But if your site slow from let's say 20 - 30 pages and you update it slowly daily most of the time will not deindex. Just my observation and theory this is like when a site is new and you get to many backlink right away this is questionable in google. I guess they also applying this in sites with to many pages in just the first day of launch. It's just my thought...
go to yourcache(dot)com and track your indexed google page. I have mine for a whole 2 months and it goes up and down. It's nothing new.
I have a new website and at one moment it is indexed and the next time it is gone. I am used to it now
Well actually its not Google giving all webmasters a hard time...I have over 75 webproperties I market for myself and others and none face these issues you speak of. What Google is doing is trying to do is defend itself against those that try to ...influence the organic results with paid links like the sig example seen below: A.K.A Link Spam or currently we are seeing the once useful occassional article written by some, now being turned into another soon to be spam term... Article Spam....... So youre kind of shooting yourself in the foot IMHO Peace