Webinar attendees kicked out of mtg

[Scandela9]

I hosted a 15-20 min webinar today for about 8-9 people and I noticed that a couple of them left and came back a few times while we were speaking. Afterwards, 3 people emailed to say they kept being kicked out - no error or message, just kicked out and then they would have to rejoin. I don't know why that would be, but I'm left wondering if there were other attendees who tried to join and first and were kicked out and didn't return. I tend not to think so, but I can't be sure until I check the attendance list I guess. But any idea why they were being kicked out at all?