diff --git a/personal/test_file.py b/personal/test_file.py
index 081b977..6795e0a 100644
--- a/personal/test_file.py
+++ b/personal/test_file.py
@@ -8,7 +8,7 @@ log = discord_logging.init_logging()
 
 
 if __name__ == "__main__":
-	input_path = r"\\MYCLOUDPR4100\Public\reddit\requests\jeanyp"
+	input_path = r"\\MYCLOUDPR4100\Public\reddit\requests\wallstreetbets_comments.zst"
 
 	input_file_paths = []
 	if os.path.isdir(input_path):
@@ -27,11 +27,16 @@ if __name__ == "__main__":
 		file_lines = 0
 		file_bytes_processed = 0
 		created = None
+		previous_timestamp = None
 		inserts = []
 		for obj, line, file_bytes_processed in utils.read_obj_zst_meta(file_path):
-			created = datetime.utcfromtimestamp(int(obj['created_utc']))
+			new_timestamp = int(obj['created_utc'])
+			created = datetime.utcfromtimestamp(new_timestamp)
+			if previous_timestamp is not None and previous_timestamp - (60 * 60 * 4) > new_timestamp:
+				log.warning(f"Out of order timestamps {datetime.utcfromtimestamp(previous_timestamp).strftime('%Y-%m-%d %H:%M:%S')} - 4 hours > {created.strftime('%Y-%m-%d %H:%M:%S')}")
+			previous_timestamp = new_timestamp
 			file_lines += 1
-			if file_lines % 100000 == 0:
+			if file_lines % 10000 == 0:
 				log.info(f"{files_processed}/{len(input_file_paths)}: {file_name} : {created.strftime('%Y-%m-%d %H:%M:%S')} : {file_lines:,} : {(file_bytes_processed / file_size) * 100:.0f}%")
 
 		log.info(f"{files_processed}/{len(input_file_paths)}: {file_name} : {created.strftime('%Y-%m-%d %H:%M:%S')} : {file_lines:,} : 100%")
diff --git a/scripts/combine_folder_multiprocess.py b/scripts/combine_folder_multiprocess.py
index c604985..453b5aa 100644
--- a/scripts/combine_folder_multiprocess.py
+++ b/scripts/combine_folder_multiprocess.py
@@ -108,6 +108,20 @@ def load_file_list(output_folder, output_file_name):
 		return None
 
 
+# recursively decompress and decode a chunk of bytes. If there's a decode error then read another chunk and try with that, up to a limit of max_window_size bytes
+def read_and_decode(reader, chunk_size, max_window_size, previous_chunk=None, bytes_read=0):
+	chunk = reader.read(chunk_size)
+	bytes_read += chunk_size
+	if previous_chunk is not None:
+		chunk = previous_chunk + chunk
+	try:
+		return chunk.decode()
+	except UnicodeDecodeError:
+		if bytes_read > max_window_size:
+			raise UnicodeError(f"Unable to decode frame after reading {bytes_read:,} bytes")
+		return read_and_decode(reader, chunk_size, max_window_size, chunk, bytes_read)
+
+
 # open a zst compressed ndjson file and yield lines one at a time
 # also passes back file progress
 def read_lines_zst(file_name):
@@ -115,12 +129,7 @@ def read_lines_zst(file_name):
 		buffer = ''
 		reader = zstandard.ZstdDecompressor(max_window_size=2**31).stream_reader(file_handle)
 		while True:
-			data_chunk = reader.read(2**27)
-			try:
-				chunk = data_chunk.decode()
-			except UnicodeDecodeError:
-				data_chunk += reader.read(2**29)
-				chunk = data_chunk.decode()
+			chunk = read_and_decode(reader, 2**27, (2**29) * 2)
 			if not chunk:
 				break
 			lines = (buffer + chunk).split("\n")
@@ -257,7 +266,7 @@ if __name__ == '__main__':
 		progress_queue.put([start_time, total_lines_processed, total_bytes_processed])
 		speed_queue = Queue(40)
 		for file in files_to_process:
-			log.debug(f"Processing file: {file.input_path}")
+			log.info(f"Processing file: {file.input_path}")
 		# start the workers
 		with multiprocessing.Pool(processes=min(args.processes, len(files_to_process))) as pool:
 			workers = pool.starmap_async(process_file, [(file, working_folder, queue, args.field, value, values, args.case_sensitive) for file in files_to_process], error_callback=log.info)
@@ -282,6 +291,7 @@ if __name__ == '__main__':
 					total_bytes_processed += file.bytes_processed
 					total_lines_errored += file.error_lines
 					files_processed += 1 if file.complete or file.error_message is not None else 0
+					files_errored += 1 if file.error_message is not None else 0
 					i += 1
 				if file_update.complete or file_update.error_message is not None:
 					save_file_list(input_files, args.output, args.name)
diff --git a/scripts/single_file.py b/scripts/single_file.py
index 43c22d4..92a5d38 100644
--- a/scripts/single_file.py
+++ b/scripts/single_file.py
@@ -13,21 +13,27 @@ log.setLevel(logging.DEBUG)
 log.addHandler(logging.StreamHandler())
 
 
+def read_and_decode(reader, chunk_size, max_window_size, previous_chunk=None, bytes_read=0):
+	chunk = reader.read(chunk_size)
+	bytes_read += chunk_size
+	if previous_chunk is not None:
+		chunk = previous_chunk + chunk
+	try:
+		return chunk.decode()
+	except UnicodeDecodeError:
+		if bytes_read > max_window_size:
+			raise UnicodeError(f"Unable to decode frame after reading {bytes_read:,} bytes")
+		log.info(f"Decoding error with {bytes_read:,} bytes, reading another chunk")
+		return read_and_decode(reader, chunk_size, max_window_size, chunk, bytes_read)
+
+
 def read_lines_zst(file_name):
-	skip_to = 3566550750
-	bytes_read = 0
 	with open(file_name, 'rb') as file_handle:
 		buffer = ''
 		reader = zstandard.ZstdDecompressor(max_window_size=2**31).stream_reader(file_handle)
 		#reader.read(40000000000)
 		while True:
-			data_chunk = reader.read(2**27)
-			try:
-				chunk = data_chunk.decode()
-			except UnicodeDecodeError:
-				log.info("Decoding error, reading a second chunk")
-				data_chunk += reader.read(2**29)
-				chunk = data_chunk.decode()
+			chunk = read_and_decode(reader, 2**27, (2**29) * 2)
 
 			if not chunk:
 				break