Missing portions of my recording

Hey guys, have a bug I’d like to ask about. I started a recording yesterday and it looks like the first 15 minutes or so of our conversation is not on the file itself. Any reason why this may happen? I started recording when we began talking, the host on the other end heard the “recording” prompt but yet when I listen to the file it picks up ~15 mins into the conversation. Any reason why this may be occurring?