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@@ -1793,6 +1793,11 @@ reference - see <strong>klippy/extras/servo.py</strong> as an example.</p>
   during the <code>load_config()</code> or "connect event" phases. Use either
   <code>raise config.error("my error")</code> or <code>raise printer.config_error("my
   error")</code> to report the error.</li>
+<li>Do not store a reference to the <code>config</code> object in a class member
+  variable (nor in any similar location that may persist past initial
+  module loading). The <code>config</code> object is a reference to a "config
+  loading phase" class and it is not valid to invoke its methods after
+  the "config loading phase" has completed.</li>
 <li>Use the "pins" module to configure a pin on a micro-controller. This
   is typically done with something similar to
   <code>printer.lookup_object("pins").setup_pin("pwm",