server acceted weirdly

Umm yesterday when there were like 13 people were on and all of a sudden people left at the same time and me and one other person were on then about 60 sec later he and i disconcted i got back in but i was disconnect in the first 30 secs

Love the server btw

Lol the reason for this is it happens with the software there's posts about it on mcforge forums. Also it could be that there are to many people on for my computer to handle so they get disconnected