LR4 Jackpot 3 Random Error Issues

LowRider CNC Troubleshooting
1

I built a LR4 with a Jackpot 3 controller (Nov 2025) and had great success. The unit was very accurate and consistent. I took a break from using it in Feb to design a guitar in Fusion and a couple days ago I was ready to start cutting out the neck. I powered up my cnc and uploaded the files into the SD card via the web interface. I was then presented with a ‘‘Low memory: 4996 bytes’’. I thought maybe my fusion NCprogram toolpath files were too big. Rebooted, same error. Following direction from my idiot AI Co-Pilot, it indicated that my config.yaml file was too large. I checked the file and there was nothing wrong with it. I decided to upgrade the unit from v3.9.9 to the latest v4.0.2 using the Web installer. After successfully upgrading it, it seemed to work ok. I managed to complete 10 toolpaths on my neck and then it randomly started freezing up and in two cases mid toolpath. When thiis would happen it would report ‘500 - Internal Server Errors’. Rebooted unit and this error continued but at different times. I thought perhaps it could be my android tablet or wifi and tried my garage pc instead…no difference. I plugged in a usb cable and used the FluidNC Web Installer to try to find out what was happening. It presented me with a ‘[MSG:ERR: Configuration is invalid. Check boot messages for ERR’s.’ whenever this happened.

I thought perhaps the sd card was bad, so I removed it and found the internal server errors continued. I also remove the motor connections and same error appears. I measured the voltage and I am exactly 24V with no fluctuation.

I also powered up the board with only usb and i am able to sometimes trigger an connection error when trying to access the fluidnc web interface wifi settings or the FluidNC settings. When it does this it states in the terminal:

MSG:DBG: WebSocket connect cid#1 from 192.168.0.125 uri / session YNDNHFML
MSG:DBG: WebSocket error cid#1
MSG:DBG: WebSocket disconnect cid#1

Whats going on with this thing? It was rock solid. Is the ESP32 crashing for some reason?
Should I try a fresh install of everything or do i risk it locking up while upgrading? I have been fighting with this thing for a few days now. It seems to be getting worst.

Any help or tips are appreciated.

2

sorry it posted ‘You can’t use ‘macro parameter character #’ in math mode’ instead of
”[MSG:DBG: WebSocket connect cid#1 from 192.168.0.125 uri / session YNDNHFML]

MSG:DBG: WebSocket error cid#1

[MSG:DBG: WebSocket disconnect cid#1]”

3

Before you do anything else, you should revert to a known good config.yaml file and then we can start working your issue.

Using AI to tune your settings is worse than asking the stupidest person you know to make random changes to your machine and hoping that works out for the best. It seldom does.

Depending on what FluidNC version you have, we might want to have you update.

4

Thanks for the response MakerJim. I upgraded from v3.9.9 to v4.0.2 due to the ‘‘Low memory: 4996 bytes” warning I was initially getting.

Quick question. If the JP3 was having issues with connecting or getting kicked off my eero 6E router that is 6ft from it (possible f/w issues), would that cause this strange behavior? Would this cause the machine to alarm out and freeze?

Also is there an easy way to share my config.yaml file for you guys to look at?