I just bought today at 21.46 on the drop figuring it would go back to 21.80 by the end of the day!!
I guess nobody's worried because they talk about everything else but the reason it went down.
The short answer is, I don't know..............but, a wild guess is that it may be because of options expiration on Friday. The max pain price is $21 and it may be gravitating toward that for a Friday close before it goes back up.