diff --git a/API/APIModels.cs b/API/APIModels.cs
index a6b3746..7c54069 100644
--- a/API/APIModels.cs
+++ b/API/APIModels.cs
@@ -47,10 +47,12 @@ namespace SafeBagDE70.API
             TaskSendHealthCheck(deviceStatus).ContinueWith(t => {
                 if (t.IsCompletedSuccessfully)
                 {
+                    AppData.IsInternetOk = true;
                     Log.Information("Send HealthCheck Success");
                 }
                 else
                 {
+                    AppData.IsInternetOk = false;
                     Log.Information("Send HealthCheck Fail");
                 }
             });
diff --git a/AppData.cs b/AppData.cs
index f8b06b3..59b31fb 100644
--- a/AppData.cs
+++ b/AppData.cs
@@ -36,6 +36,7 @@ namespace SafeBagDE70
         public static int MaxNotes = 300;
         public static string BaseURL = "";
         public static int TenantId = 0;
+        public static bool IsInternetOk = false;
         public static DeviceStatus? _DeviceStatus = null;
         public static DeviceStatus? DeviceStatus
         {
diff --git a/DepositSMUCv2.xaml.cs b/DepositSMUCv2.xaml.cs
index 2c0e14e..e61214c 100644
--- a/DepositSMUCv2.xaml.cs
+++ b/DepositSMUCv2.xaml.cs
@@ -392,46 +392,9 @@ namespace SafeBagDE70
                     AppData.DeviceStatus.DeviceTime = DateTime.Now;
                     APIModels.SendHealthCheck(AppData.DeviceStatus);
                 }
-                if (countSensorTimer % 1800 == 0)
+                if (countSensorTimer % 300 == 0)
                 {
-                    if (!AppData.IsInTransaction)
-                    {
-                        Task.Run(async () =>
-                        {
-                            try
-                            {
-                                using (var context = new CDMDbContext())
-                                {
-                                    var startTime = DateTime.Now.Date.AddDays(-2).Date;
-                                    var unsentHist = context.Histories
-                                    .Where(x => x.DepositTime >= startTime)
-                                    .Where(x => ((x.IsSent == null || x.IsSent == false)))
-                                    .ToList();
-                                    foreach(var item in unsentHist)
-                                    {
-                                        var data2Send = JsonConvert.DeserializeObject<CountingData2Send>(item.Data);
-                                        var bResult = await APIModels.SendCountingData(data2Send);
-                                        if (bResult)
-                                        {
-                                            item.IsSent = true;
-                                            context.Update(item);
-                                            context.SaveChanges();
-                                            Log.Information("Resend: " + item.Data + " successfully");
-                                        }
-                                        else
-                                        {
-                                            Log.Error("Resend: " + item.Data + " failed");
-                                        }    
-                                    }
-                                }
-                            }
-                            catch (Exception ex)
-                            {
-                                Log.Fatal(ex,"Resend failed");
-                            }
-
-                        });
-                    }
+                    ResenData();
                 }
                 countSensorTimer++;
                 sensorTimer.IsEnabled = false;
@@ -444,6 +407,53 @@ namespace SafeBagDE70
             }
             sensorTimer.IsEnabled = true;
         }
+        static Task? resendTask=null;
+        private static void ResenData()
+        {
+            if (!AppData.IsInTransaction && AppData.IsInternetOk)
+            {
+
+                if(resendTask==null || resendTask.IsCompleted)
+                {
+                    resendTask = Task.Run(async () =>
+                    {
+                        try
+                        {
+                            using (var context = new CDMDbContext())
+                            {
+                                var startTime = DateTime.Now.Date.AddDays(-2).Date;
+                                var unsentHist = context.Histories
+                                .Where(x => x.DepositTime >= startTime)
+                                .Where(x => ((x.IsSent == null || x.IsSent == false)))
+                                .ToList();
+                                foreach (var item in unsentHist)
+                                {
+                                    var data2Send = JsonConvert.DeserializeObject<CountingData2Send>(item.Data);
+                                    var bResult = await APIModels.SendCountingData(data2Send);
+                                    if (bResult)
+                                    {
+                                        item.IsSent = true;
+                                        context.Update(item);
+                                        context.SaveChanges();
+                                        Log.Information("Resend: " + item.Data + " successfully");
+                                    }
+                                    else
+                                    {
+                                        Log.Error("Resend: " + item.Data + " failed");
+                                    }
+                                }
+                            }
+                        }
+                        catch (Exception ex)
+                        {
+                            Log.Fatal(ex, "Resend failed");
+                        }
+                    });
+                }
+               
+            }
+        }
+
         Stopwatch watch = new Stopwatch();
         private void GetSensorValue()
         {