Due to network congestion you may experience problems when recording a stream. BBC offers lots of on-demand streams so if you have a choice between live and on-demand streams, record only the latter ones. There are at least two reasons for this. First of all when recording on-demand streams you may usually use multiple threads so the recording can be done much faster. And second of all disconnection problems won't worry you anymore.

Here are some more tips I suggest you to read:
Troubleshooting: Poor audio/video quality of a stream