Trocen TL-3120 problem

[LightBurn (Oz)]

I would start here (it sounds like USB sleep behavior):

How to troubleshoot connection issues with USB

A very common problem with Windows systems and lasers is the way Windows handles USB connections - If it thinks a connection is idle, it can put the port into a power-save mode, which can make your device stop talking to it. This is especially common with laptops. If you are having issues where you often lose the USB connection after a period of time, try the following: Windows 7: Disable USB Power Management on Windows 7 Machines Windows 10: How to disable Windows 10's 'USB selective suspen…