Upload Debug Log
To upload and access the NXT debug log, you want to go to the M Series ToolBox app -> View -> Service Menus -> Upload Debug Log
I took a snippet out of the manual regarding opening the toolbox and uploading the debug log. Once you upload it, you can attach and send it over to support@ijetcolor.com along with your problem.
I attached a link to the entire manual for reference as well. https://mynxt.ijetcolorwizard.com/articles/126241-user-manual