[deepinfra-node README]: exec on a stopped sandbox raises ConflictError (409): restart the sandbox before running commands. If Sandbox.create fails while the sandbox is coming up, the raised error carries the sandboxId: use it to inspect or terminate the orphaned sandbox instead of leaking capacity. Use try/finally or a context manager so sandboxes terminate even when the workload throws; a leaked sandbox keeps counting against the per-account cap until you clean it up.

Context: Two sandbox failure modes with built-in recovery handles.