diff --git a/go.sum b/go.sum
index 1e1a7a0bd66..445f0dbe5c8 100644
--- a/go.sum
+++ b/go.sum
@@ -126,6 +126,8 @@ github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
+github.com/cosmos/cosmos-sdk v0.40.0-rc0 h1:GY+jzuVILZ7wlx5Zic2W0rWlo47fZgN048xV458sUAo=
+github.com/cosmos/cosmos-sdk v0.40.0-rc0/go.mod h1:YZcO00Tq/qqj4ncsfn+PobyTelsot7wEMGPpxEbEAT0=
 github.com/cosmos/go-bip39 v0.0.0-20180819234021-555e2067c45d h1:49RLWk1j44Xu4fjHb6JFYmeUnDORVwHNkDxaQ0ctCVU=
 github.com/cosmos/go-bip39 v0.0.0-20180819234021-555e2067c45d/go.mod h1:tSxLoYXyBmiFeKpvmq4dzayMdCjCnu8uqmCysIGBT2Y=
 github.com/cosmos/iavl v0.15.0-rc4 h1:P1wmET7BueqCzfxsn+BzVkDWDLY9ij2JNwkbIdM7RG8=
diff --git a/relayer/naive-strategy.go b/relayer/naive-strategy.go
index 4129ff8696d..7ad25f0e378 100644
--- a/relayer/naive-strategy.go
+++ b/relayer/naive-strategy.go
@@ -244,6 +244,7 @@ func (nrs *NaiveStrategy) sendTxFromEventPackets(src, dst *Chain, rlyPackets []r
 			MaxTxSize:    nrs.MaxTxSize,
 			MaxMsgLength: nrs.MaxMsgLength,
 		}
+		unlock()
 
 		// add the packet msgs to RelayPackets
 		for _, rp := range rlyPackets {
@@ -464,7 +465,7 @@ func relayPacketFromQueryResponse(src, dst *PathEnd, res *ctypes.ResultTx,
 
 			// if we have decided not to relay this packet, don't add it
 			switch {
-			case sh.GetHeight(src.ChainID) >= rp.timeout:
+			case rp.timeout != 0 && sh.GetHeight(dst.ChainID) >= rp.timeout:
 				timeoutPackets = append(timeoutPackets, rp.timeoutPacket())
 			case rp.timeoutStamp != 0 && time.Now().UnixNano() >= int64(rp.timeoutStamp):
 				timeoutPackets = append(timeoutPackets, rp.timeoutPacket())
diff --git a/relayer/relayMsgs.go b/relayer/relayMsgs.go
index e0e06311550..fb106792ec3 100644
--- a/relayer/relayMsgs.go
+++ b/relayer/relayMsgs.go
@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/gogo/protobuf/proto"
+
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
@@ -60,15 +62,20 @@ func (r *RelayMsgs) Send(src, dst *Chain) {
 
 	// submit batches of relay transactions
 	for _, msg := range r.Src {
+		bz, err := proto.Marshal(msg)
+		if err != nil {
+			panic(err)
+		}
+
 		msgLen++
-		txSize += uint64(len(msg.GetSignBytes()))
+		txSize += uint64(len(bz))
 
 		if r.IsMaxTx(msgLen, txSize) {
 			// Submit the transactions to src chain and update its status
 			r.success = r.success && send(src, msgs)
 
 			// clear the current batch and reset variables
-			msgLen, txSize = 1, uint64(len(msg.GetSignBytes()))
+			msgLen, txSize = 1, uint64(len(bz))
 			msgs = []sdk.Msg{}
 		}
 		msgs = append(msgs, msg)
@@ -84,15 +91,20 @@ func (r *RelayMsgs) Send(src, dst *Chain) {
 	msgs = []sdk.Msg{}
 
 	for _, msg := range r.Dst {
+		bz, err := proto.Marshal(msg)
+		if err != nil {
+			panic(err)
+		}
+
 		msgLen++
-		txSize += uint64(len(msg.GetSignBytes()))
+		txSize += uint64(len(bz))
 
 		if r.IsMaxTx(msgLen, txSize) {
 			// Submit the transaction to dst chain and update its status
 			r.success = r.success && send(dst, msgs)
 
 			// clear the current batch and reset variables
-			msgLen, txSize = 1, uint64(len(msg.GetSignBytes()))
+			msgLen, txSize = 1, uint64(len(bz))
 			msgs = []sdk.Msg{}
 		}
 		msgs = append(msgs, msg)