diff --git a/wasmsdk/blobber.go b/wasmsdk/blobber.go
index 3f4add853..f0e65a394 100644
--- a/wasmsdk/blobber.go
+++ b/wasmsdk/blobber.go
@@ -1086,7 +1086,19 @@ func repairAllocation(allocationID, callbackFuncName string) error {
 		return err
 	}
 	wg.Wait()
-	return statusBar.err
+	if statusBar.err != nil {
+		fmt.Println("Error in repair allocation: ", statusBar.err)
+		return statusBar.err
+	}
+	status, _, err := alloc.CheckAllocStatus()
+	if err != nil {
+		return err
+	}
+	if status == sdk.Repair || status == sdk.Broken {
+		fmt.Println("allocation repair failed")
+		return errors.New("allocation repair failed")
+	}
+	return nil
 }
 
 // checkAllocStatus check the status of the allocation, either it is ok, needs repair or broken
diff --git a/zboxcore/sdk/chunked_upload.go b/zboxcore/sdk/chunked_upload.go
index 22dc58a74..3aa10eb8d 100644
--- a/zboxcore/sdk/chunked_upload.go
+++ b/zboxcore/sdk/chunked_upload.go
@@ -412,6 +412,7 @@ func (su *ChunkedUpload) process() error {
 		su.statusCallback.Started(su.allocationObj.ID, su.fileMeta.RemotePath, su.opCode, int(su.fileMeta.ActualSize)+int(su.fileMeta.ActualThumbnailSize))
 	}
 	su.startProcessor()
+	defer su.chunkReader.Release()
 	defer su.chunkReader.Close()
 	defer su.ctxCncl(nil)
 	for {
diff --git a/zboxcore/sdk/chunked_upload_chunk_reader.go b/zboxcore/sdk/chunked_upload_chunk_reader.go
index c576ebd92..a54159b3c 100644
--- a/zboxcore/sdk/chunked_upload_chunk_reader.go
+++ b/zboxcore/sdk/chunked_upload_chunk_reader.go
@@ -33,6 +33,8 @@ type ChunkedUploadChunkReader interface {
 	GetFileHash() (string, error)
 	//Reset reset offset
 	Reset()
+	//Release Buffer
+	Release()
 }
 
 // chunkedUploadChunkReader read chunk bytes from io.Reader. see detail on https://github.com/0chain/blobber/wiki/Protocols#what-is-fixedmerkletree
@@ -315,7 +317,6 @@ func (r *chunkedUploadChunkReader) Close() {
 	r.closeOnce.Do(func() {
 		close(r.hasherDataChan)
 		r.hasherWG.Wait()
-		uploadPool.Put(r.fileShardsDataBuffer)
 	})
 
 }
@@ -328,6 +329,10 @@ func (r *chunkedUploadChunkReader) GetFileHash() (string, error) {
 	return r.hasher.GetFileHash()
 }
 
+func (r *chunkedUploadChunkReader) Release() {
+	uploadPool.Put(r.fileShardsDataBuffer)
+}
+
 func (r *chunkedUploadChunkReader) hashData() {
 	defer r.hasherWG.Done()
 	for data := range r.hasherDataChan {
diff --git a/zboxcore/sdk/downloadworker.go b/zboxcore/sdk/downloadworker.go
index 08c554bbd..e6cba05b1 100644
--- a/zboxcore/sdk/downloadworker.go
+++ b/zboxcore/sdk/downloadworker.go
@@ -559,7 +559,7 @@ func (req *DownloadRequest) processDownload() {
 				req.bufferMap[blobberIdx] = zboxutil.NewDownloadBufferWithChan(sz, bufBlocks, req.effectiveBlockSize)
 			} else {
 				bufMask := zboxutil.NewDownloadBufferWithMask(sz, bufBlocks, req.effectiveBlockSize)
-				bufMask.SetNumBlocks(int(numBlocks))
+				bufMask.SetNumBlocks(int(bufBlocks))
 				req.bufferMap[blobberIdx] = bufMask
 			}
 		}
@@ -996,6 +996,7 @@ func (req *DownloadRequest) errorCB(err error, remotePathCB string) {
 		return
 	}
 	req.skip = true
+	logger.Logger.Error("Download failed: ", err, " remotefilepath: ", remotePathCB)
 	if req.localFilePath != "" {
 		if info, err := req.fileHandler.Stat(); err == nil && info.Size() == 0 {
 			os.Remove(req.localFilePath) //nolint: errcheck
diff --git a/zboxcore/sdk/repairworker.go b/zboxcore/sdk/repairworker.go
index bfb42fd8c..1b570ce02 100644
--- a/zboxcore/sdk/repairworker.go
+++ b/zboxcore/sdk/repairworker.go
@@ -77,6 +77,10 @@ func (r *RepairRequest) processRepair(ctx context.Context, a *Allocation) {
 		SetSingleClietnMode(true)
 		defer SetSingleClietnMode(false)
 	}
+	if shouldSaveProgress {
+		SetSaveProgress(false)
+		defer SetSaveProgress(true)
+	}
 	r.iterateDir(a, r.listDir)
 	if r.statusCB != nil {
 		r.statusCB.RepairCompleted(r.filesRepaired)