Cura closes during print ?

I have had several occasions now, while printing to my Mini 2 from Cura, my print just stops. I look at my PC and all is well, except Cura is no longer open. There was no reboot of the PC. I think I did lose my internet connection during that time, but that should 't matter should it? Of course printing from an SD card solves the problem, but I’d rather trust Cura. Any ideas?

Without seeing your logs, it’s hard to tell. Find the Cura LE logs here, and while you’re there, feel free to submit a bug report:

Lulzbot support suggested checking my sleep settings on the PC. It was 2 hours. Stopped printing at about 2 hours. That must be it. Thanks.