As it seems to me, the more hype around the project, the stronger it will fall after a very strong growth.
In my opinion, it is normally happen because after launching of ICO's more people are buy stocks of token and they holding it because they just want to save it for the future value. More traders are doing that they buy high numbers of token then they sell it immediately or hold it.
It will fall when there is no decent exchanges right after the ICO, the FUD are all over and this weak hands are gonna sell.
One factor to consider also is when it's traded with a low volume and the bounty will be release, for sure, there will be some dump that will happen.