follow up, bambu are sending me a replacement internal buffer.
I have the same issue. Machine prints with the external spool. Only made 3 small print jobs and two being off the included sd card. Pretty disappointed for a new machine out of the box. Any help would be appreciated. Thanks.
Did the new buffer fix the issue?
I have not received it yet, its a slow delivery from Germany down to Spain where I am.
I could get get an answer out of support if the log files contain error messages on buffer when it fails.
I would suggest you contact support and reference this posting and other users have same problem.
I would not be surprised if its a firmware issue in the end.