Updated FAQ (mediawiki)

FAQ.mediawiki

@@ -20,6 +20,11 @@ Non USB-to-Serial devices like mass-storage, mouse, GPC receivers, ... and rarel
 
 A common issue is wrong baud rate.
 
+== My device sporadically disconnects with <code>Queueing USB request failed</code> ==
+
+Typically an issues with the USB device, e.g.
+* USB requests are temporarily not handled in your program
+* power supply insufficient, causing hardware reset
 
 == Baud rate <code>12345</code> does not work ==