Although there is no youtube footage of it, I recall in the mid 1990s, BBC2 having serious problems trying to play out The Money Programme. The titles ran, but a minute into the first report, the problems began, with the VT
jumping about. So, apology slide and music. They then decided to start the whole programme again, only for the programme to go wrong just after the opening titles!
Also, one that used to be on youtube, but isn't anymore, unless someone can find it. The famous time Coronation Street started one evening in the 1980s, and just after the opening titles began, the programme paused and totally ground to a halt.
My dad described it as "the best thing ever to happen to Corrie!"