diff --git a/acra-core/src/main/java/org/acra/builder/ReportExecutor.java b/acra-core/src/main/java/org/acra/builder/ReportExecutor.java
index d345fdacc..50f2fc420 100644
--- a/acra-core/src/main/java/org/acra/builder/ReportExecutor.java
+++ b/acra-core/src/main/java/org/acra/builder/ReportExecutor.java
@@ -18,6 +18,7 @@
 import android.content.Context;
 import android.os.Debug;
 import android.os.Looper;
+import android.os.StrictMode;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.widget.Toast;
@@ -162,8 +163,10 @@ public final void execute(@NonNull final ReportBuilder reportBuilder) {
             processFinisher.finishLastActivity(reportBuilder.getUncaughtExceptionThread());
         }
         if (blockingAdministrator == null) {
+            StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskWrites();
             final File reportFile = getReportFileName(crashReportData);
             saveCrashReportFile(reportFile, crashReportData);
+            StrictMode.setThreadPolicy(oldPolicy);
 
             final ReportInteractionExecutor executor = new ReportInteractionExecutor(context, config);
             if (reportBuilder.isSendSilently()) {
diff --git a/acra-core/src/main/java/org/acra/util/ApplicationStartupProcessor.java b/acra-core/src/main/java/org/acra/util/ApplicationStartupProcessor.java
index 49adbac50..bc93b4736 100644
--- a/acra-core/src/main/java/org/acra/util/ApplicationStartupProcessor.java
+++ b/acra-core/src/main/java/org/acra/util/ApplicationStartupProcessor.java
@@ -21,6 +21,7 @@
 import android.content.pm.PackageInfo;
 import android.os.Handler;
 import android.support.annotation.NonNull;
+
 import org.acra.ACRA;
 import org.acra.config.CoreConfiguration;
 import org.acra.file.BulkReportDeleter;
@@ -49,8 +50,8 @@ public ApplicationStartupProcessor(@NonNull Context context, @NonNull CoreConfig
     }
 
     public void checkReports(boolean enableAcra) {
-        //application is not ready in onAttachBaseContext, so delay this
-        new Handler(context.getMainLooper()).post(() -> {
+        //application is not ready in onAttachBaseContext, so delay this. also run it on a background thread because we're doing disk I/O
+        new Handler(context.getMainLooper()).post(() -> new Thread(() -> {
             if (config.deleteOldUnsentReportsOnApplicationStart()) {
                 deleteUnsentReportsFromOldAppVersion();
             }
@@ -61,7 +62,7 @@ public void checkReports(boolean enableAcra) {
                 sendApprovedReports();
                 approveOneReport();
             }
-        });
+        }).start());
     }
 
     private void approveOneReport() {