Dear Mr. Berko: On your advice, I didn't buy stock in GoPro in 2015, when it was trading at $56. And about a year later, it fell to $8. But as it recovered and rose to $16, my stockbroker had me buy 1,000 shares. It immediately fell to $10. I sold it and took a 6-point loss. Now it's about $5, and he's advising me to buy another 1,000 shares. We both think it has finally hit the bottom. What do you think?