Buffered audio problem

I had a problem in a meeting today and I'm hoping someone can offer some advice. The meeting had been active for 5 hours  but had broken for lunch. The Connect room was left open during the break and an uploaded mp3 file was playing. When we returned from the break, we ended the mp3 (which was playing perfectly) and our microphones went live but the audio was choppy. Oddly, we weren't losing anything. Instead, the chops in the audio were just pauses, i.e. a word would start- then silence- then it would pick up exactly where it left off. It also seemed to play fast when it was playing at all. All of our attendees experienced this problem. The problem seemed to resolve once I switched the feed to a different system (a Macbook). Our network was open and operating perfectly, so no problem there. Does the audio buffer at any point (local, server, attendee) and, if so, is there a way to avoid it happening again?