diff --git a/src/dsp_tools/commands/fast_xmlupload/process_files.py b/src/dsp_tools/commands/fast_xmlupload/process_files.py
index 5403681fa..89310f5a0 100644
--- a/src/dsp_tools/commands/fast_xmlupload/process_files.py
+++ b/src/dsp_tools/commands/fast_xmlupload/process_files.py
@@ -110,10 +110,14 @@ def _process_files_in_parallel(
         - a list of all paths that could not be processed
           (this list will only have content if a Docker API error led to a restart of the SIPI container)
     """
+    batchsize = 1000
+    msg = f"Processing {len(files_to_process)} files, in batches of {batchsize} files each..."
+    print(msg)
     orig_filepath_2_uuid: list[tuple[Path, Optional[Path]]] = []
-    for batch in make_chunks(lst=files_to_process, length=1000):
+    for batch in make_chunks(lst=files_to_process, length=batchsize):
         if unprocessed_paths := _launch_thread_pool(nthreads, input_dir, output_dir, batch, orig_filepath_2_uuid):
             return orig_filepath_2_uuid, unprocessed_paths
+        print(f"Processed {len(orig_filepath_2_uuid)}/{len(files_to_process)} files")
     return orig_filepath_2_uuid, []
 
 
@@ -124,6 +128,7 @@ def _launch_thread_pool(
     files_to_process: list[Path],
     orig_filepath_2_uuid: list[tuple[Path, Optional[Path]]],
 ) -> list[Path]:
+    counter = 0
     total = len(files_to_process)
     with ThreadPoolExecutor(max_workers=nthreads) as pool:
         processing_jobs = [pool.submit(_process_file, f, input_dir, output_dir) for f in files_to_process]
@@ -131,8 +136,8 @@ def _launch_thread_pool(
             try:
                 orig_file, internal_file = processed.result()
                 orig_filepath_2_uuid.append((orig_file, internal_file))
-                msg = f"Successfully processed file {len(orig_filepath_2_uuid)}/{total} of this batch: {orig_file}"
-                print(f"{datetime.now()}: {msg}")
+                counter += 1
+                msg = f"Successfully processed file {counter}/{total} of this batch: {orig_file}"
                 logger.info(msg)
             except docker.errors.APIError:
                 print(f"{datetime.now()}: ERROR: A Docker exception occurred. Cancel jobs and restart SIPI...")
@@ -222,16 +227,18 @@ def _get_file_paths_from_xml(xml_file: Path) -> list[Path]:
     """
     tree: etree._ElementTree[etree._Element] = etree.parse(xml_file)
     bitstream_paths: set[Path] = set()
+    errors = []
     for x in tree.iter():
         if x.text and etree.QName(x).localname.endswith("bitstream"):
             path = Path(x.text)
             if path.is_file():
                 bitstream_paths.add(path)
             else:
-                msg = f"{datetime.now()}: ERROR: '{path}' is referenced in the XML file, but it doesn't exist."
-                logger.error(msg)
-                raise UserError(msg)
-
+                errors.append(f"'{path}' is referenced in the XML file, but it doesn't exist.")
+    if errors:
+        msg = "\n".join(errors)
+        logger.error(msg)
+        raise UserError(msg)
     return list(bitstream_paths)
 
 
@@ -251,7 +258,7 @@ def _restart_sipi_container(
     global sipi_container
     docker_client = docker.from_env()
     sipi_container = docker_client.containers.run(
-        image="daschswiss/sipi:3.8.1",
+        image="daschswiss/sipi:3.8.6",
         name="sipi",
         volumes=[
             f"{input_dir.absolute()}:/sipi/processing-input",
@@ -341,7 +348,6 @@ def _convert_file_with_sipi(
         return False
     result = sipi_container.exec_run(f"/sipi/sipi '{in_file_sipi_path}' {out_file_sipi_path}")
     if result.exit_code != 0:
-        print(f"{datetime.now()}: ERROR: Sipi conversion of {in_file_local_path} failed: {result}")
         logger.error(f"Sipi conversion of {in_file_local_path} failed: {result}")
         return False
     return True
@@ -668,12 +674,18 @@ def _process_image_file(
         If there was an error, the internal filename is None.
     """
     converted_file_full_path = out_dir / Path(internal_filename).with_suffix(".jp2")
-    sipi_result = _convert_file_with_sipi(
-        in_file_local_path=in_file,
-        input_dir=input_dir,
-        out_file_local_path=converted_file_full_path,
-        output_dir=out_dir,
-    )
+    sipi_result = False
+    counter = 0
+    while not sipi_result:
+        sipi_result = _convert_file_with_sipi(
+            in_file_local_path=in_file,
+            input_dir=input_dir,
+            out_file_local_path=converted_file_full_path,
+            output_dir=out_dir,
+        )
+        counter += 1
+        if counter > 4:
+            break
     if not sipi_result:
         print(f"{datetime.now()}: ERROR: Couldn't process file of category IMAGE: {in_file}")
         logger.error(f"Couldn't process file of category IMAGE: {in_file}")