Any idea why the price of Ethereum dropped so much recently? Is that due to the second hard fork?
I think that it most certainly is as a result of the second hard fork. Ethereum has so many flaws (security issues) and has gone through so many controversies, that maybe this has resulted in many investors to get out of ETH. Also, ETC's price is declining but in the bright side I hope that ETH becomes stronger after all of these past events.
I think that it would be wise to buy a few ETH while this happens. Maybe then, after all of this is solved prices could go all the way up again. Just sharing my opinion.

I doubt that. Perhaps a small part, but updates to the protocol that fix security issues is no reason for a price drop, and that's what the recent releases have been about. Furthermore, this update wasn't a controversial one at all, so I don't understand the reasoning behind why this would deflate the price. Much more likely: it's because of the BTC price rising. It's very very typical for alt coin prices to fall as BTC price rises. This has been observed many times before, on many different blockchains.