3018 errors on spindle movement (over 66 for speed)

[mdrich-com]

Candle: 1.1.7
GRBL 1.1

Some Microcenter 3018 CNC, don't know if it had branding or was just "Inland" special.

Summary: I have reviewed other support posts in a few places as well as here related to similar errors, something else using the port, and so on, but nothing has helped or handled this particular issue where all commands seem to work until the spindle is needed at a speed greater than S66.

Windows 10 this attempt... tried mac and other software as well.

Different issues abound between different computers and software, don't know if it's hardware. Below is the issue on This Candle software, and likely what the other softwares are going through without Candle's visible errors.

Multiple Errors based on action:

Opening the program:

[CTRL+X]
Serial port error 5: Framing error detected while reading
Serial port error 9: The handle is invalid
[CTRL+x]

and sometimes this is at the bottom
S1000 < ok

"Send" demo code of the dragon.nc (https://drive.google.com/drive/folders/1l4xZtNnJZ88bZK3SVoXL5RmyOaPeGQyL) from Sainsmart 3018 I get this:

Serial port error 2: Access is Denied
[CTRL+X] < Grbl 1.1 ['$' for help]
Grbl 1.1 ['$' for help]

and sometimes this follows that

[CTRL+X]
Serial port error 5: Framing error detected while reading
Serial port error 9: The handle is invalid
[CTRL+x]
S1000 < ok
Grbl 1.1 ['$' for help]

happens at Line 3: G0X0.000Y00.000S1000M3 which reports in the State and Response columns as "Processed" and "ok"
Lines 4-15 are "Sent" and ""
Lines 16-180814 (End of the instructions) are "In queue" and ""

Jog left, right, up, down...
No messages, moves as expected.

`

`

Start spindle:
(I hear the USB disconnected sound and sometimes the reconnect sound immediately)

M3 S900 < ok
Serial port error 2: Access is denied.
[CTRL+X] < Grbl 1.1 ['$' for help]
Grbl 1.1 ['$' for help]

Sometimes I receive these errors in addition:
Serial port error 11: A device which does not exist was specified
Or
Serial port error 1: and something about a directory... don't have that one handy to get exactly.

On some other software I can get the spindle to spin and stop or the program to start running the paths, but it will not spin the spindle and run the path at the same time (or as needed). Those will have to be in other forums, but I have modified the GCode with several options to run the spindle etc... in those programs.

Troubleshooting:

• Installed Drivers "successfully," restart machine, restart computer, unplug and plug in USB, different computers, new computers (new from box, I have a lot in this office), VM with fresh installs, checking port settings such as baud and so on... to match instructions (115200, 8, none, 1 none).

-Driver is from CH341SER installer from SainSmart

• Deleted S commands for the spindle from the dragon.nc file. It is running fine now, happily moving without a running spindle.
• Different spindle speeds. If it matters, "Spindle" is sometimes written in red text in the menus and the speed is sometimes red in the little text box
  -- Setting Spindle to 1 will run without error, but obviously not "work"
  -- I can run the spindle from 0-66, at 67 errors start
  -- Placing S66 or 60 as speed instead of the S1000 on the line where the error happens still has an error. Speeds up to 66 only work on manual press of the spindle button on the right side UNTIL I manually set to 0, press the spindle button and then run the code again. Running that, I receive an error at a random location less than 20 lines later

-Update: I've tried running Candle as administrator. Sometimes I get
Serial port error 7: Access is Denied
Same text as others, but the error number is different.