Are you sure you were on the trial? I wouldn't have thought a single resync would cause its removal..
At the time, I think the belief was that the trial was - for any single line - a one-off affair. The trial would stop at the next resync, no matter the cause of that resync.
That would limit the negative impact of the trial, to any one end-user, to 2 resyncs. The first to start the trial, and the second that would end it - whether it is triggered by instability after 30 minutes, or by a power cut weeks later.