diff --git a/core/src/main/java/io/github/lsposed/lspd/service/ActivityManagerService.java b/core/src/main/java/io/github/lsposed/lspd/service/ActivityManagerService.java
index 6ea5ad72..b60a9599 100644
--- a/core/src/main/java/io/github/lsposed/lspd/service/ActivityManagerService.java
+++ b/core/src/main/java/io/github/lsposed/lspd/service/ActivityManagerService.java
@@ -27,6 +27,9 @@ import android.os.Bundle;
 import android.os.IBinder;
 import android.os.RemoteException;
 import android.os.ServiceManager;
+import android.util.Log;
+
+import static io.github.lsposed.lspd.service.ServiceManager.TAG;
 
 public class ActivityManagerService {
     private static IActivityManager am = null;
@@ -35,6 +38,20 @@ public class ActivityManagerService {
     public static IActivityManager getActivityManager() {
         if (binder == null && am == null) {
             binder = ServiceManager.getService("activity");
+            if (binder == null) return null;
+            try {
+                binder.linkToDeath(new IBinder.DeathRecipient() {
+                    @Override
+                    public void binderDied() {
+                        Log.w(TAG, "am is dead");
+                        binder.unlinkToDeath(this, 0);
+                        binder = null;
+                        am = null;
+                    }
+                }, 0);
+            } catch (RemoteException e) {
+                Log.e(TAG, Log.getStackTraceString(e));
+            }
             am = IActivityManager.Stub.asInterface(binder);
         }
         return am;
diff --git a/core/src/main/java/io/github/lsposed/lspd/service/BridgeService.java b/core/src/main/java/io/github/lsposed/lspd/service/BridgeService.java
index 28e35adc..690ed903 100644
--- a/core/src/main/java/io/github/lsposed/lspd/service/BridgeService.java
+++ b/core/src/main/java/io/github/lsposed/lspd/service/BridgeService.java
@@ -97,6 +97,7 @@ public class BridgeService {
             }
 
             bridgeService.unlinkToDeath(this, 0);
+            listener.onSystemServerDied();
             sendToBridge(serviceBinder, true);
         }
     }
@@ -113,6 +114,8 @@ public class BridgeService {
         void onSystemServerRestarted();
 
         void onResponseFromBridgeService(boolean response);
+
+        void onSystemServerDied();
     }
 
     private static Listener listener;
diff --git a/core/src/main/java/io/github/lsposed/lspd/service/ServiceManager.java b/core/src/main/java/io/github/lsposed/lspd/service/ServiceManager.java
index 2369cb6d..a3af8dfb 100644
--- a/core/src/main/java/io/github/lsposed/lspd/service/ServiceManager.java
+++ b/core/src/main/java/io/github/lsposed/lspd/service/ServiceManager.java
@@ -42,6 +42,10 @@ public class ServiceManager {
         }
     }
 
+    private static void putBinderForSystemServer() {
+        android.os.ServiceManager.addService("serial", (IBinder) mainService);
+    }
+
     // call by ourselves
     public static void start() {
         Log.i(TAG, "starting server...");
@@ -56,7 +60,7 @@ public class ServiceManager {
         applicationService = new LSPApplicationService();
         managerService = new LSPManagerService();
 
-        android.os.ServiceManager.addService("serial", (IBinder) mainService);
+        putBinderForSystemServer();
 
         waitSystemService("package");
         waitSystemService("activity");
@@ -77,6 +81,12 @@ public class ServiceManager {
                     Log.w(TAG, "no response from bridge");
                 }
             }
+
+            @Override
+            public void onSystemServerDied() {
+                Log.w(TAG, "system server died");
+                putBinderForSystemServer();
+            }
         });
 
         try {
diff --git a/core/src/main/java/io/github/lsposed/lspd/service/UserService.java b/core/src/main/java/io/github/lsposed/lspd/service/UserService.java
index 16b8b5b2..3cfb408f 100644
--- a/core/src/main/java/io/github/lsposed/lspd/service/UserService.java
+++ b/core/src/main/java/io/github/lsposed/lspd/service/UserService.java
@@ -25,9 +25,12 @@ import android.os.IBinder;
 import android.os.IUserManager;
 import android.os.RemoteException;
 import android.os.ServiceManager;
+import android.util.Log;
 
 import java.util.List;
 
+import static io.github.lsposed.lspd.service.ServiceManager.TAG;
+
 public class UserService {
     private static IUserManager um = null;
     private static IBinder binder = null;
@@ -35,6 +38,20 @@ public class UserService {
     public static IUserManager getUserManager() {
         if (binder == null && um == null) {
             binder = ServiceManager.getService("user");
+            if (binder == null) return null;
+            try {
+                binder.linkToDeath(new IBinder.DeathRecipient() {
+                    @Override
+                    public void binderDied() {
+                        Log.w(TAG, "um is dead");
+                        binder.unlinkToDeath(this, 0);
+                        binder = null;
+                        um = null;
+                    }
+                }, 0);
+            } catch (RemoteException e) {
+                Log.e(TAG, Log.getStackTraceString(e));
+            }
             um = IUserManager.Stub.asInterface(binder);
         }
         return um;