diff --git a/BililiveRecorder.Core/Recording/RawDataRecordTask.cs b/BililiveRecorder.Core/Recording/RawDataRecordTask.cs
index 941f9d3..1213810 100644
--- a/BililiveRecorder.Core/Recording/RawDataRecordTask.cs
+++ b/BililiveRecorder.Core/Recording/RawDataRecordTask.cs
@@ -27,23 +27,22 @@ namespace BililiveRecorder.Core.Recording
 
         protected override void StartRecordingLoop(Stream stream)
         {
-            var paths = this.CreateFileName();
+            var (fullPath, relativePath) = this.CreateFileName();
 
             try
-            { Directory.CreateDirectory(Path.GetDirectoryName(paths.fullPath)); }
+            { Directory.CreateDirectory(Path.GetDirectoryName(fullPath)); }
             catch (Exception) { }
 
             this.fileOpeningEventArgs = new RecordFileOpeningEventArgs(this.room)
             {
                 SessionId = this.SessionId,
-                FullPath = paths.fullPath,
-                RelativePath = paths.relativePath,
+                FullPath = fullPath,
+                RelativePath = relativePath,
                 FileOpenTime = DateTimeOffset.Now,
             };
             this.OnRecordFileOpening(this.fileOpeningEventArgs);
 
-
-            var file = new FileStream(paths.fullPath, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.Read | FileShare.Delete);
+            var file = new FileStream(fullPath, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.Read | FileShare.Delete);
 
             _ = Task.Run(async () => await this.WriteStreamToFileAsync(stream, file).ConfigureAwait(false));
         }
diff --git a/BililiveRecorder.Core/Recording/RecordTaskBase.cs b/BililiveRecorder.Core/Recording/RecordTaskBase.cs
index 37f9402..d032b0e 100644
--- a/BililiveRecorder.Core/Recording/RecordTaskBase.cs
+++ b/BililiveRecorder.Core/Recording/RecordTaskBase.cs
@@ -44,7 +44,7 @@ namespace BililiveRecorder.Core.Recording
 
             this.ct = this.cts.Token;
 
-            this.timer.Elapsed += this.Timer_Elapsed_TriggerStats;
+            this.timer.Elapsed += this.Timer_Elapsed_TriggerNetworkStats;
         }
 
         public Guid SessionId { get; } = Guid.NewGuid();
@@ -90,7 +90,7 @@ namespace BililiveRecorder.Core.Recording
 
         protected abstract void StartRecordingLoop(Stream stream);
 
-        private void Timer_Elapsed_TriggerStats(object sender, ElapsedEventArgs e)
+        private void Timer_Elapsed_TriggerNetworkStats(object sender, ElapsedEventArgs e)
         {
             int bytes;
             TimeSpan diff;
@@ -129,12 +129,12 @@ namespace BililiveRecorder.Core.Recording
 
         protected (string fullPath, string relativePath) CreateFileName()
         {
-            var formatString = room.RoomConfig.RecordFilenameFormat!;
+            var formatString = this.room.RoomConfig.RecordFilenameFormat!;
 
             var now = DateTime.Now;
             var date = now.ToString("yyyyMMdd");
             var time = now.ToString("HHmmss");
-            var randomStr = random.Next(100, 999).ToString();
+            var randomStr = this.random.Next(100, 999).ToString();
 
             var relativePath = formatString
                 .Replace(@"{date}", date)
diff --git a/BililiveRecorder.Core/RecordingStats.cs b/BililiveRecorder.Core/RecordingStats.cs
index 3039281..f6abbce 100644
--- a/BililiveRecorder.Core/RecordingStats.cs
+++ b/BililiveRecorder.Core/RecordingStats.cs
@@ -16,6 +16,11 @@ namespace BililiveRecorder.Core
         private long totalOutputBytes;
         private double duraionRatio;
 
+        public RecordingStats()
+        {
+            this.Reset();
+        }
+
         public TimeSpan SessionDuration { get => this.sessionDuration; set => this.SetField(ref this.sessionDuration, value); }
         public TimeSpan SessionMaxTimestamp { get => this.sessionMaxTimestamp; set => this.SetField(ref this.sessionMaxTimestamp, value); }
         public TimeSpan FileMaxTimestamp { get => this.fileMaxTimestamp; set => this.SetField(ref this.fileMaxTimestamp, value); }
@@ -32,7 +37,7 @@ namespace BililiveRecorder.Core
             this.SessionDuration = TimeSpan.Zero;
             this.SessionMaxTimestamp = TimeSpan.Zero;
             this.FileMaxTimestamp = TimeSpan.Zero;
-            this.DuraionRatio = 0;
+            this.DuraionRatio = double.NaN;
             this.TotalInputBytes = 0;
             this.TotalOutputBytes = 0;
             this.NetworkMbps = 0;
diff --git a/BililiveRecorder.Core/Room.cs b/BililiveRecorder.Core/Room.cs
index 2ef83d7..0e3ba50 100644
--- a/BililiveRecorder.Core/Room.cs
+++ b/BililiveRecorder.Core/Room.cs
@@ -223,6 +223,7 @@ namespace BililiveRecorder.Core
                 task.RecordSessionEnded += this.RecordTask_RecordSessionEnded;
                 this.recordTask = task;
                 this.recordTaskStartTime = DateTimeOffset.UtcNow;
+                this.Stats.Reset();
                 this.OnPropertyChanged(nameof(this.Recording));
 
                 _ = Task.Run(async () =>
@@ -368,6 +369,8 @@ namespace BililiveRecorder.Core
             this.basicDanmakuWriter.Disable();
 
             this.OnPropertyChanged(nameof(this.Recording));
+            this.Stats.Reset();
+
             RecordSessionEnded?.Invoke(this, new RecordSessionEndedEventArgs(this)
             {
                 SessionId = id
diff --git a/BililiveRecorder.WPF/Converters/RatioToColorBrushConverter.cs b/BililiveRecorder.WPF/Converters/RatioToColorBrushConverter.cs
index 874e0ca..8e499ce 100644
--- a/BililiveRecorder.WPF/Converters/RatioToColorBrushConverter.cs
+++ b/BililiveRecorder.WPF/Converters/RatioToColorBrushConverter.cs
@@ -8,6 +8,7 @@ namespace BililiveRecorder.WPF.Converters
 {
     internal class RatioToColorBrushConverter : IValueConverter
     {
+        private static readonly SolidColorBrush Disabled = new SolidColorBrush(Colors.AliceBlue);
         private static readonly SolidColorBrush[] ColorMap;
 
         static RatioToColorBrushConverter()
@@ -29,7 +30,12 @@ namespace BililiveRecorder.WPF.Converters
 
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
-            var i = (int)Math.Ceiling((1.1d - Math.Abs((1d - (double)value) * 4d)) * 20d);
+            var input = (double)value;
+
+            if (double.IsNaN(input))
+                return Disabled;
+
+            var i = (int)Math.Ceiling((1.1d - Math.Abs((1d - input) * 4d)) * 20d);
             return i switch
             {
                 < 0 => ColorMap[0],