As far as my experience with them is concerned , it is a great company to invest your money and this incident can be a one off incident . They got wonderful products , best in the industry and Top customers and the running of the company is also great ..

It's possible that someone in the company was waiting to sell some shares. This is not uncommon, depending on their position it could be illegal.

They may even buy them back once they drop, so they pocket the cash difference while still keeping the same number of shares