bubble burst
1) When something has been going exceeding well only to then run its inevitable course and either decline or fail altogether; a market correction.

2) a term adopted in business to describe an event that is currently faultering or failing or has the potential to do so.
1) I thought my job as a lawyer was recession-proof, but when Jesus returned, sent all the sinners to hell and left everyone remaining on Earth singing Kum By Ya, that bubble burst!

2) In 2007: My house was just appraised at 130% of what I bought it for and I don't think the market can support more than that for much longer. I'm going to sell it now before the bubble bursts next year.