Lumen looked poised for another day of explosive growth, but major risk factors came into focus. The stock of Lumen Technologies (LUMN 5.40%) was surging again in Thursday's trading. The telecom specialist's share price ended the daily session up 5.4%, according to data from S&P Global Market Intelligence. But the stock had been up as much as 33.3% early in today's trading. Lumen has been on a bullish tear lately thanks to new deals and partnerships. Despite volatility today, the company was able to keep it ...