A bank run is a pretty specific thing (https://en.wikipedia.org/wiki/Bank_run), you shouldn't use that term for any general situation where lots of people decide to sell something at the same time, or where a price of something drops precipitously.
There often is a run on the exchanges, with people desperately trying to withdraw cash or cryptos before the exchange collapses. Often that's what pushes the price to the very top. On one or two exchanges there is a liquidity crisis, so people will bid up Bitcoin because that can be the fastest way to get money off the exchange.
Feel free to contribute a more accurate term
"illusion of patterns in randomness"
Panic sell
Price drop. Supply glut. Demand shortage. Investor flight. Fire sale.
Bubble collapse
Flash crash? Especially if it involves a lot of limit orders triggering, which is quite likely in the case of bitcoin.