Greetings, I'm using CNCJS to control my TopsCNC Heavy using the Arduino/Shield to stepper motor drivers as recommended in this forum.  I am running CNCJS on a Raspberry Pi 4 (8 Gb).  About half the time the projects completes without any problems, but often I receive a message stating the connection to the server is lost.  When this happens, the CNC continues to cut, usually finishing the project and returning to Machine Home, but CNCJS stops updating position and status.  CNCJS does not freeze.  It shows the router bit spinning in place in the location where it was last connected.

Sometimes the error occurs in the first minute or two of the cut.  Occasionally it happens before cutting, while uploading g-code.

Does anyone have any ideas what would cause this loss of connection or feedback to CNCJS?  Thank you for any assistance you can provide.