Hi joebiker;
Welcome to the forum.
I don't believe it has anything to do with the Bubba pucks, but you can easily test that by running some bisquettes through into an empty bowl, without using the Bubba pucks. Then use tongs to knock off the bisquettes that is still on the burner; that way you don't waste any bisquettes.
That problem is an unusual one. When you receive any of the "E" errors that will shut down the bisquette burner and element. For it to display an "E" error then advance three pucks, there may be a loose connection, or something wrong with your key pad, or maybe you are pushing the advance button to rapidly.
If you are rapidly pushing the advance button three times. Try pushing the button then wait until the bisquette feeds through before advancing the next one.