Messaging WebSocket 1006 disconnects during JMeter burst

Quick question about WebSocket stability for Genesys Cloud Digital Messaging under concurrent load.

Running JMeter 5.6.2 from Singapore targeting /api/v2/conversations/messages. Simulating 100 concurrent WebSocket connections using the WebSocket Samplers plugin. Connections establish fine initially but start dropping with error code 1006 (Abnormal Closure) after exactly 60 seconds when pushing 50 messages per second per thread. The server side logs show no corresponding 429 rate limit errors. Is there a specific hard limit on message throughput per WebSocket session that triggers an immediate drop without a rate limit header? Need to know if this is a client-side buffer issue or a platform-side capacity cap for free trial orgs.