1. Broken streaming may be a sign of issues with the VDSL or it could be the ISP congestion, or it could be the radio station itself.
2. It is called ping and tracert, these let you monitor whether small packets are getting around successfully.
3. In terms of lost packets 0% is ideal, but I think most people get well under 0.1%, if you are seeing 2 or 3% then annoying gaps may be the issue.
Which speed test are you using? Ours at http://www.thinkbroadband.com/speedtest.html
gives the throughput graphs which can reveal issues like congestion, stalls and other things. Alas not got into AI programming to automatically detect them.