Bricking the device with long messages

Hello Jürgen, I had a problem with long text messages. 
When sending more than 8192 bytes, the message(s) will be displayed, but after turning of it never starts again. So I lost 4 badges.
Greetings Klaus

led-badge-11x44.py

@@ -463,6 +463,10 @@ def header(lengths, speeds, modes, blink, ants):
 
 # print(buf)      # array('B', [119, 97, 110, 103, 0, 0, 0, 0, 48, 48, 48, 48, 48, 48, 48, 48, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 60, 126, 255, 255, 255, 255, 126, 60, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
 
+if len(buf) > 8192:
+  print ("Writing more than 8192 bytes damages the display!")
+  sys.exit(1)
+
 if have_pyhidapi:
   pyhidapi.hid_write(dev, buf)
 else: