"Nope. I haven't been subject to the pattern day trader rule. "
Other people, pattern day traders or not, experience large drops when the stock goes 5th digit and sometimes 2 or 3 different companies in one's portfolio takes that 5th digit temporary hit.
It causes a margin call. Had it shown up during an open market they simply buy more at .0001 to bounce the value of their account back up...But if that 5th digit shows after the market is closed....THEN.... their account drops below the 25 grand.
News 
Market Data 
Discover 
