diff --git a/eth/downloader/skeleton.go b/eth/downloader/skeleton.go
index b3edda7a0c..fe7d6fb436 100644
--- a/eth/downloader/skeleton.go
+++ b/eth/downloader/skeleton.go
@@ -500,7 +500,12 @@ func (s *skeleton) sync(head *types.Header) (*types.Header, error) {
 				log.Debug("Beacon sync merged subchains")
 				return nil, errSyncMerged
 			}
-			// We still have work to do, loop and repeat
+		// We still have work to do, loop and repeat
+
+		default:
+			log.Debug("Select loop timeout, no events received")
+			// sleep a short time
+			time.Sleep(time.Millisecond * 100)
 		}
 	}
 }
@@ -911,7 +916,18 @@ func (s *skeleton) revertRequest(req *headerRequest) {
 
 	// Remove the request from the tracked set and mark the task as not-pending,
 	// ready for rescheduling
+	log.Warn("ZXL: revert request", "tasknum", (s.scratchHead-req.head)/requestHeaders, "peerId", req.peer)
 	s.scratchOwners[(s.scratchHead-req.head)/requestHeaders] = ""
+	// retry
+	//s.idles[req.peer] = s.getPeerConnectionByPeerId(req.peer) // not here but need here
+}
+
+func (s *skeleton) getPeerConnectionByPeerId(peer string) *peerConnection {
+	peerConn, ok := s.peers.peers[peer]
+	if !ok {
+		return nil
+	}
+	return peerConn
 }
 
 func (s *skeleton) processResponse(res *headerResponse) (linked bool, merged bool) {
diff --git a/eth/protocols/eth/handler.go b/eth/protocols/eth/handler.go
index 0fd495fc3f..3001e7ccbe 100644
--- a/eth/protocols/eth/handler.go
+++ b/eth/protocols/eth/handler.go
@@ -17,6 +17,7 @@
 package eth
 
 import (
+	"errors"
 	"fmt"
 	"math/big"
 	"time"
@@ -24,6 +25,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/eth/etherror"
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/p2p/enode"
@@ -160,11 +162,11 @@ func Handle(backend Backend, peer *Peer) error {
 			case errors.Is(err, etherror.ErrNoHeadersDelivered):
 				// ignore no headers delivered
 				peer.Log().Warn("Message handling failed with no headers")
-
-			case errors.Is(err, etherror.ErrHeaderBatchAnchorLow):
-				// ignore lower header anchor within tolerance
-				peer.Log().Warn("Message handling failed with lower batch anchor")
 		*/
+		case errors.Is(err, etherror.ErrHeaderBatchAnchorLow):
+			// ignore lower header anchor within tolerance
+			peer.Log().Warn("Message handling failed with lower batch anchor")
+
 		case err != nil:
 			peer.Log().Debug("Message handling failed in `eth`", "err", err)
 			return err