diff --git a/app/src/main/java/io/legado/app/model/CacheBook.kt b/app/src/main/java/io/legado/app/model/CacheBook.kt
index f09b358de..7bba3acc0 100644
--- a/app/src/main/java/io/legado/app/model/CacheBook.kt
+++ b/app/src/main/java/io/legado/app/model/CacheBook.kt
@@ -300,10 +300,13 @@ object CacheBook {
             WebBook.getContent(scope, bookSource, book, chapter, executeContext = IO)
                 .onSuccess { content ->
                     onSuccess(chapter)
+                    ReadBook.downloadedChapters.add(chapter.index)
+                    ReadBook.downloadFailChapters.remove(chapter.index)
                     downloadFinish(chapter, content, resetPageOffset)
                 }.onError {
                     onError(chapter, it)
-                    ReadBook.downloadFailChapters.add(chapter.index)
+                    ReadBook.downloadFailChapters[chapter.index] =
+                        (ReadBook.downloadFailChapters[chapter.index] ?: 0) + 1
                     downloadFinish(chapter, "获取正文失败\n${it.localizedMessage}", resetPageOffset)
                 }.onCancel {
                     onCancel(chapter.index)
diff --git a/app/src/main/java/io/legado/app/model/ReadBook.kt b/app/src/main/java/io/legado/app/model/ReadBook.kt
index d1da43d97..38591a222 100644
--- a/app/src/main/java/io/legado/app/model/ReadBook.kt
+++ b/app/src/main/java/io/legado/app/model/ReadBook.kt
@@ -55,7 +55,7 @@ object ReadBook : CoroutineScope by MainScope() {
 
     var preDownloadTask: Coroutine<*>? = null
     val downloadedChapters = hashSetOf<Int>()
-    val downloadFailChapters = hashSetOf<Int>()
+    val downloadFailChapters = hashMapOf<Int, Int>()
     var contentProcessor: ContentProcessor? = null
     val downloadScope = CoroutineScope(SupervisorJob() + IO)
 
@@ -545,7 +545,7 @@ object ReadBook : CoroutineScope by MainScope() {
                 val maxChapterIndex = min(durChapterIndex + AppConfig.preDownloadNum, chapterSize)
                 for (i in durChapterIndex.plus(2)..maxChapterIndex) {
                     if (downloadedChapters.contains(i)) continue
-                    if (downloadFailChapters.contains(i)) continue
+                    if ((downloadFailChapters[i] ?: 0) >= 3) continue
                     downloadIndex(i)
                 }
             }
@@ -553,7 +553,7 @@ object ReadBook : CoroutineScope by MainScope() {
                 val minChapterIndex = durChapterIndex - min(5, AppConfig.preDownloadNum)
                 for (i in durChapterIndex.minus(2) downTo minChapterIndex) {
                     if (downloadedChapters.contains(i)) continue
-                    if (downloadFailChapters.contains(i)) continue
+                    if ((downloadFailChapters[i] ?: 0) >= 3) continue
                     downloadIndex(i)
                 }
             }
diff --git a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeBookSourceDialog.kt b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeBookSourceDialog.kt
index 8055a41e4..5c1d38f39 100644
--- a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeBookSourceDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeBookSourceDialog.kt
@@ -95,6 +95,13 @@ class ChangeBookSourceDialog() : BaseDialogFragment(R.layout.dialog_book_change_
     }
 
     override fun onFragmentCreated(view: View, savedInstanceState: Bundle?) {
+        context?.obtainStyledAttributes(intArrayOf(android.R.attr.homeAsUpIndicator))?.use {
+            binding.toolBar.navigationIcon = it.getDrawable(0)
+            binding.toolBar.setNavigationContentDescription(androidx.appcompat.R.string.abc_action_bar_up_description)
+            binding.toolBar.setNavigationOnClickListener {
+                dismissAllowingStateLoss()
+            }
+        }
         binding.toolBar.setBackgroundColor(primaryColor)
         viewModel.initData(arguments, callBack?.oldBook, activity is ReadBookActivity)
         showTitle()
@@ -109,6 +116,9 @@ class ChangeBookSourceDialog() : BaseDialogFragment(R.layout.dialog_book_change_
     private fun showTitle() {
         binding.toolBar.title = viewModel.name
         binding.toolBar.subtitle = viewModel.author
+        context?.obtainStyledAttributes(intArrayOf(android.R.attr.homeAsUpIndicator))?.use {
+            binding.toolBar.navigationIcon = it.getDrawable(0)
+        }
     }
 
     private fun initMenu() {
@@ -152,6 +162,7 @@ class ChangeBookSourceDialog() : BaseDialogFragment(R.layout.dialog_book_change_
         searchView.setOnSearchClickListener {
             binding.toolBar.title = ""
             binding.toolBar.subtitle = ""
+            binding.toolBar.navigationIcon = null
         }
         searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
             override fun onQueryTextSubmit(query: String?): Boolean {
diff --git a/app/src/main/res/layout/dialog_book_change_source.xml b/app/src/main/res/layout/dialog_book_change_source.xml
index b4b9ecc16..9d8ad1ffa 100644
--- a/app/src/main/res/layout/dialog_book_change_source.xml
+++ b/app/src/main/res/layout/dialog_book_change_source.xml
@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    xmlns:tools="http://schemas.android.com/tools"
     android:background="@color/background">
 
     <androidx.appcompat.widget.Toolbar
@@ -13,9 +13,10 @@
         android:background="@color/background_menu"
         android:elevation="5dp"
         android:theme="?attr/actionBarStyle"
-        app:layout_constraintTop_toTopOf="parent"
+        app:contentInsetStartWithNavigation="0dp"
         app:displayHomeAsUp="false"
         app:fitStatusBar="false"
+        app:layout_constraintTop_toTopOf="parent"
         app:popupTheme="@style/AppTheme.PopupOverlay"
         app:titleTextAppearance="@style/ToolbarTitle" />
 
@@ -29,19 +30,19 @@
         android:id="@+id/recycler_view"
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        app:layout_constraintTop_toBottomOf="@+id/refresh_progress_bar"
+        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
         app:layout_constraintBottom_toTopOf="@+id/ll_bottom_bar"
-        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />
+        app:layout_constraintTop_toBottomOf="@+id/refresh_progress_bar" />
 
     <LinearLayout
         android:id="@+id/ll_bottom_bar"
         android:layout_width="match_parent"
         android:layout_height="36dp"
         android:background="@color/background"
-        android:paddingLeft="10dp"
-        android:paddingRight="10dp"
         android:gravity="center_vertical"
         android:orientation="horizontal"
+        android:paddingLeft="10dp"
+        android:paddingRight="10dp"
         app:layout_constraintBottom_toBottomOf="parent">
 
         <TextView
@@ -51,10 +52,10 @@
             android:layout_weight="1"
             android:background="?android:attr/selectableItemBackgroundBorderless"
             android:ellipsize="middle"
+            android:gravity="center_vertical"
             android:paddingLeft="10dp"
             android:paddingRight="10dp"
             android:singleLine="true"
-            android:gravity="center_vertical"
             android:textColor="@color/primaryText"
             android:textSize="12sp" />