Hi Kit,

Looks like you've got two good responses to explore already; I'd add that you can find more information out using event viewer which may help figure out what has gone on. For the uninitiated, here are a couple of screenshots which should help show how to get there and what to look for. Gold dust would be finding an application error on UCCNC at the time of the crash, and you can use the other tabs to see if anything else on the system was happening simultaneously.

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Are you running any plugins on UCCNC?

Have you double checked the power management settings to ensure that the PC never sleeps/hibernates etc? Sometimes you can also look at the drivers for the network card and set this specifically to stay awake which is important to keep UCCNC working well and connected.

FYI I've recently updated my CNC PC to Windows 10 (to get wireless Xbox controller support... I might to a how-to on that soon, it is after all awesome), I'm running v1.211, so will keep an eye out for similar behaviour.