Makerverse / Windows 10 COM ports crashing & losing the G-Code file during operation

For many days now I have been trying to cut a large file but the drawing file suddenly disappears from Makerverse and the cutting ooperation stops. I am using a Windows 10 machine hardwired CAT5 cable to my internet router. Am I alone in this strange and infuriating problem? Is Makerverse crashing or is my COM 4 port failing? How can I troubleshoot this problem so I can fix what is wrong?