I wouldn't say that it collapsed, it's only slightly under its IPO price, $134 vs. $135.

However it's not going up and later this month the first lockup period ends and people who got stock options are allowed to sell some of their stocks. These people don't care if the price is $134 or $135, because they go in much much lower, down to $30, from what I can tell. So starting this month there's going to be new shares available to buy, and the sellers are less critical of the price your offering.