Change your margin(default) account to a cash account to prevent your brokerage from lending your shares to short sellers without your knowledge. Brokerages earn fees by lending to short sellers at your expense. A cash account is protected by SEC laws which prevents the brokerage from lending out your shares. A cash account requires you to already have the funds available prior to purchasing securities. Proactive investors should convert to a cash account to protect their portfolios.
The last big decline was caused by disappointing work on an upgrade. It pays to buy on bad news sometimes.. I understand that it caused someone who was too leveraged to have problems. People should understand the risk when they use leverage including shorting and diversify out.