User-level circuit breakers

Daily loss limit hit → halt all live trading for the day.
Max drawdown breached → halt until released.

See circuit breakers for details.

Credential errors

Credential revoked or invalidated at the venue.
Verify-credentials call fails N times in a row.

Strategy moves to error status with the failure reason on the detail page.

Exchange refusals

Repeated order rejections (insufficient margin, symbol delisted, exchange in maintenance).
The engine retries with backoff; after enough failures it stops the strategy.

Position-manager reconciliation failures

If the engine detects that its internal position state diverges significantly from the exchange's, it halts the strategy rather than risk a bad order.

What auto-stop does NOT do

Does not close open positions. Stops new entries; existing positions remain.
Does not auto-restart. You must re-enable from the strategy detail page after fixing the cause.