Groupon Software Engineer In Test - Performance & Scalability interview questions

I received two phone interviews, the first interviewer seem going to sleep when he talk to me, there sometimes like 20s slot in the middle of he asking me question, and I just keep waiting for him to going on, he seems not interested in me at all, but I pass the first round in the end. The second interview I did very well, I answered almost every single question he asked, including SQL query questions as well as two small coding question, he said I did an excellent job, but I was rejected in the second round.