Architect IVR WebSocket drops during JMeter spike

No idea why this is happening, the WebSocket connection drops with a 4001 error when the JMeter script hits 50 concurrent users in the ap-southeast-1 region. The flow is simple, just a basic menu, but the drop rate spikes to 80% after 10 seconds. Here is the current flow config:

flow_id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
steps:
 - type: start
 next: menu
 - type: gather_input
 id: menu
 max_digits: 1
 timeout: 5000
 next: end

It’s worth reviewing at the WebSocket keep-alive intervals in your JMeter script, as the default Genesys Cloud timeout often triggers a 4001 if no ping is received within the expected window during high concurrency. Increasing the ping frequency or adjusting the client-side idle timeout usually resolves these drops.