diff --git a/drivers/net/mctp/mctp-i3c.c b/drivers/net/mctp/mctp-i3c.c
index 008e2bb4a0b393..3e2dc03cf64279 100644
--- a/drivers/net/mctp/mctp-i3c.c
+++ b/drivers/net/mctp/mctp-i3c.c
@@ -412,14 +412,21 @@ static void mctp_i3c_xmit(struct mctp_i3c_bus *mbus, struct sk_buff *skb)
 	data[data_len] = pec;
 
 	xfer.data.out = data;
+
+	/* add sleep of 1ms before and after the trasmit to give
+	 * time to the slow target devices to empty the previously
+	 * sent requests. Needed especially when the MCTP message
+	 * consists of multiple fragments.
+	 */
+	msleep (1);
 	rc = i3c_device_do_priv_xfers(mi->i3c, &xfer, 1);
+	msleep (1);
 	if (rc == 0) {
 		stats->tx_bytes += data_len;
 		stats->tx_packets++;
 	} else {
 		stats->tx_errors++;
 	}
-
 out:
 	if (mi)
 		mutex_unlock(&mi->lock);
diff --git a/net/mctp/route.c b/net/mctp/route.c
index 556886bd3636d4..009a4054fc0628 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -27,7 +27,7 @@
 #include <trace/events/mctp.h>
 
 static const unsigned int mctp_message_maxlen = 64 * 1024;
-static const unsigned long mctp_key_lifetime = 6 * CONFIG_HZ;
+static const unsigned long mctp_key_lifetime = 2 * 6 * CONFIG_HZ;
 
 static void mctp_flow_prepare_output(struct sk_buff *skb, struct mctp_dev *dev);