Hit the buffers
Definition 1 of 1
Pro Tip 1/3Metaphorical Barrier
Imagine a train stopping suddenly because the track ends - this is the essence of 'hit the buffers'. 
The software development hit the buffers after the lead programmer left.
Pro Tip 2/3Unexpected Halt
'Hit the buffers' often implies a surprise or something not planned for when a pursuit stops. 
Their expansion plans hit the buffers when the market crashed.
Pro Tip 3/3Negative Outcome
The phrase usually has a negative connotation, suggesting disappointment or failure. 
The peace talks hit the buffers due to irreconcilable differences.