Originally Posted by Balek

This "sometimes" and "sometimes" thing you describe is really called a random. You can get something in your first try or you can not get it after 500. That doesn't mean the rate has changed. People in general tend to find/create explanations for things that are either not consistent or they don't understand and it has been proved scientifically. It's how the human mind works.
Think about it. What would be the point from the game developer's perspective to put increased/decreased drop chance based on time or any other factor? It's just pointless, doesn't make any sense and requires more work. And even if it was real, things like that should be known to the public from the very beginning.
HOWEVER, Nutaku is very unprofessional and it wouldn't surprise me if they MANUALLY, silently changed event items drop rate from time to time.

Well, i'm playing online games for like 10 years already, and offline games for, like 20 years, so i might say this looks too suspicious to be plain random, so i could notice some tendencies here. if the chances were constant, i either would get good?bad luck all the time, or don't get those good/bad luck streaks at certain times. in fact, i wouldn't get "streaks" at all. And if i did - that would be an outstanding event, and happened, maybe, once or twice (and be a great luck, no matter, if it is a "good luck" streak, or "bad luck" streak) not every few days. Random things are random - they give you random stuff at random rates. Not depending on what you do, and what are the conditions (missions you are subscribed to, in this case). And streaks in general are only possible, if the win chance % is pretty high (which is definately not a typical case for lottery of any sort)
Also, for the coding - GHQ has it's time-bount Sunday Rotation. If you've already coded the time based prize rotation, why can't you code time or some other condition based win chance rotation?