DEATH SPIRAL.
D5. Any situation in which a series of events or actions, especially as a consequence of one another, ultimately lead to a point of ruin, failure, or destruction.
See Example:
With the recent allegations of drug abuse, corruption charges, and controversial remarks about minorities, the long-time senator now seems locked into an irreversible death spiral. @AS? Kek
https://idioms.thefreedictionary.com/death+spiral