diff --git a/api/service/legacysync/epoch_syncing.go b/api/service/legacysync/epoch_syncing.go
index 641fb5889..8d1cb37c4 100644
--- a/api/service/legacysync/epoch_syncing.go
+++ b/api/service/legacysync/epoch_syncing.go
@@ -112,7 +112,7 @@ func syncLoop(bc core.BlockChain, syncConfig *SyncConfig) (timeout int) {
 		}
 		if otherEpoch < curEpoch {
 			for _, peerCfg := range syncConfig.GetPeers() {
-				syncConfig.RemovePeer(peerCfg, fmt.Sprintf("[EPOCHSYNC]: current height is higher that others, remove peers: %s", peerCfg.String()))
+				syncConfig.RemovePeer(peerCfg, fmt.Sprintf("[EPOCHSYNC]: current height is higher than others, remove peers: %s", peerCfg.String()))
 			}
 			return 2
 		}
diff --git a/p2p/discovery/option.go b/p2p/discovery/option.go
index ce4259270..fff8eea20 100644
--- a/p2p/discovery/option.go
+++ b/p2p/discovery/option.go
@@ -42,7 +42,9 @@ func (opt DHTConfig) GetLibp2pRawOptions() ([]libp2p_dht.Option, error) {
 		opts = append(opts, libp2p_dht.Concurrency(opt.DiscConcurrency))
 	}
 
-	opts = append(opts, libp2p_dht.DisableAutoRefresh())
+	// TODO: to disable auto refresh to make sure there is no conflicts with protocol discovery functions
+	// it's not applicable for legacy sync
+	// opts = append(opts, libp2p_dht.DisableAutoRefresh())
 
 	return opts, nil
 }
diff --git a/p2p/stream/common/streammanager/cooldown.go b/p2p/stream/common/streammanager/cooldown.go
index f22f4956f..ef6d21bc9 100644
--- a/p2p/stream/common/streammanager/cooldown.go
+++ b/p2p/stream/common/streammanager/cooldown.go
@@ -36,6 +36,8 @@ func (cache *coolDownCache) Has(id peer.ID) bool {
 
 // Add adds the peer ID to the cache
 func (cache *coolDownCache) Add(id peer.ID) {
+	cache.mu.Lock()
+	defer cache.mu.Unlock()
 	has := cache.timeCache.Has(string(id))
 	if !has {
 		cache.timeCache.Add(string(id))