So far this month:

• Feb. 3, 2014: CryptoTrade - Another Bitcoin Exchange Shuts With Little Warning
• Feb. 10, 2015: MYCoin closes its doors, $387 million in investor funds vanishes
• Feb. 11, 2015: BTCXChange - Bitcoin Exchange Closes after Lead Programmer Holds Servers Hostage
• Feb. 15, 2015: Chinese Bitcoin Exchange BTER hacked
• Feb. 18, 2015: Canada’s largest Bitcoin exchange is shutting down after a suspected hack

Who's next?

(Kipcoin just shut down, but they were clearly a Ponzi; not even going to list them.)