diff --git a/consensus/quorum/one-node-staked-vote.go b/consensus/quorum/one-node-staked-vote.go
index b51af6a15..e3a45540a 100644
--- a/consensus/quorum/one-node-staked-vote.go
+++ b/consensus/quorum/one-node-staked-vote.go
@@ -157,6 +157,9 @@ func (v *stakedVoteWeight) IsQuorumAchievedByMask(mask *bls_cosi.Mask) bool {
 	if currentTotalPower == nil {
 		return false
 	}
+	const msg = "[IsQuorumAchievedByMask] Voting power: need %+v, have %+v"
+	utils.Logger().Debug().
+		Msgf(msg, threshold, currentTotalPower)
 	return (*currentTotalPower).GT(threshold)
 }
 
diff --git a/consensus/quorum/quorum.go b/consensus/quorum/quorum.go
index b279d8ebf..867fd9967 100644
--- a/consensus/quorum/quorum.go
+++ b/consensus/quorum/quorum.go
@@ -12,6 +12,7 @@ import (
 	"github.com/harmony-one/harmony/consensus/votepower"
 	bls_cosi "github.com/harmony-one/harmony/crypto/bls"
 	shardingconfig "github.com/harmony-one/harmony/internal/configs/sharding"
+	"github.com/harmony-one/harmony/internal/utils"
 	"github.com/harmony-one/harmony/multibls"
 	"github.com/harmony-one/harmony/numeric"
 	"github.com/harmony-one/harmony/shard"
@@ -224,6 +225,10 @@ func (s *cIdentities) NthNextHmy(instance shardingconfig.Instance, pubKey *bls.P
 	idx := s.IndexOf(pubKey.Bytes)
 	if idx != -1 {
 		found = true
+	} else {
+		utils.Logger().Error().
+			Str("key", pubKey.Bytes.Hex()).
+			Msg("[NthNextHmy] pubKey not found")
 	}
 	numNodes := instance.NumHarmonyOperatedNodesPerShard()
 	// sanity check to avoid out of bound access
diff --git a/consensus/view_change.go b/consensus/view_change.go
index 7e3be93a7..5bfd49f83 100644
--- a/consensus/view_change.go
+++ b/consensus/view_change.go
@@ -142,6 +142,10 @@ func (consensus *Consensus) getNextViewID() (uint64, time.Duration) {
 
 	// timestamp messed up in current validator node
 	if curTimestamp <= blockTimestamp {
+		consensus.getLogger().Error().
+			Int64("curTimestamp", curTimestamp).
+			Int64("blockTimestamp", blockTimestamp).
+			Msg("[getNextViewID] timestamp of block too high")
 		return consensus.fallbackNextViewID()
 	}
 	// diff only increases, since view change timeout is shorter than
diff --git a/consensus/view_change_construct.go b/consensus/view_change_construct.go
index 71f9385a9..b818507eb 100644
--- a/consensus/view_change_construct.go
+++ b/consensus/view_change_construct.go
@@ -444,7 +444,8 @@ func (vc *viewChange) InitPayload(
 					vc.nilBitmap[viewID] = nilBitmap
 				}
 				if err := vc.nilBitmap[viewID].SetKey(key.Pub.Bytes, true); err != nil {
-					vc.getLogger().Warn().Str("key", key.Pub.Bytes.Hex()).Msg("[InitPayload] nilBitmap setkey failed")
+					vc.getLogger().Warn().Err(err).
+						Str("key", key.Pub.Bytes.Hex()).Msg("[InitPayload] nilBitmap setkey failed")
 					continue
 				}
 				if _, ok := vc.nilSigs[viewID]; !ok {
@@ -475,7 +476,8 @@ func (vc *viewChange) InitPayload(
 				vc.viewIDBitmap[viewID] = viewIDBitmap
 			}
 			if err := vc.viewIDBitmap[viewID].SetKey(key.Pub.Bytes, true); err != nil {
-				vc.getLogger().Warn().Str("key", key.Pub.Bytes.Hex()).Msg("[InitPayload] viewIDBitmap setkey failed")
+				vc.getLogger().Warn().Err(err).
+					Str("key", key.Pub.Bytes.Hex()).Msg("[InitPayload] viewIDBitmap setkey failed")
 				continue
 			}
 			if _, ok := vc.viewIDSigs[viewID]; !ok {
diff --git a/core/blockchain_impl.go b/core/blockchain_impl.go
index 9fa618c44..73f37f862 100644
--- a/core/blockchain_impl.go
+++ b/core/blockchain_impl.go
@@ -428,6 +428,7 @@ func (bc *BlockChainImpl) ValidateNewBlock(block *types.Block, beaconChain Block
 		bc, block.Header(),
 	); err != nil {
 		utils.Logger().Error().
+			Uint64("blockNum", block.NumberU64()).
 			Str("blockHash", block.Hash().Hex()).
 			Err(err).
 			Msg("[ValidateNewBlock] Cannot verify vrf for the new block")
diff --git a/core/rawdb/accessors_offchain.go b/core/rawdb/accessors_offchain.go
index c95cf73f5..5324aa0e5 100644
--- a/core/rawdb/accessors_offchain.go
+++ b/core/rawdb/accessors_offchain.go
@@ -21,7 +21,9 @@ func ReadShardState(
 ) (*shard.State, error) {
 	data, err := db.Get(shardStateKey(epoch))
 	if err != nil {
-		return nil, errors.New(MsgNoShardStateFromDB)
+		return nil, errors.Errorf(
+			MsgNoShardStateFromDB, "epoch: %d", epoch,
+		)
 	}
 	ss, err2 := shard.DecodeWrapper(data)
 	if err2 != nil {