src: fix random broken reconnects (#3233)

src/client/websocket/WebSocketShard.js

@@ -311,11 +311,15 @@ class WebSocketShard extends EventEmitter {
   onClose(event) {
     this.closeSequence = this.sequence;
     this.sequence = -1;
+
     this.debug(`WebSocket was closed.
       Event Code: ${event.code}
       Clean: ${event.wasClean}
       Reason: ${event.reason || 'No reason received'}`);
 
+    this.setHeartbeatTimer(-1);
+    this.setHelloTimeout(-1);
+
     this.status = Status.DISCONNECTED;
 
     /**