There is vigorous debate over different definitions and systems of fiat money and its subsequent breakdowns, but there are a few commonalities. First, it always fails in the end.
Second, the failure of money always happens with a loss of confidence by the people who use it. Eventually, a reset to a 'new and improved' money system restores confidence and the cycle often runs its course for the next few unsuspecting generations.
As we currently witness what appears to be an unprecedented global slow death of money, modern media is providing ringside seats to this loss of confidence. For your consideration: When Money Dies.